Wednesday, 13 August 2025

Earth crust composition


Earth crust composition

More than 90% on the crust is composed of silicate minerals. Most abundant silicates are feldspars (plagioclase (39%) and alkali feldspar (12%)). Other common silicate minerals are quartz (12%) pyroxenes (11%), amphiboles (5%), micas (5%), and clay minerals (5%). The rest of the silicate family comprises 3% of the crust. Only 8% of the crust is composed of non-silicates — carbonates, oxides, sulfides, etc.
Clay minerals are too small to be shown individually. Even with a light microscope you will see only mud or dust depending on whether these minerals are wet or dry. Clay minerals are silicates that are the products of weathering of other silicate minerals, mostly feldspars.
The most abundant rock types in the crust
Rocks are divided into three broad groups: igneous, metamorphic, and sedimentary rocks. The oceanic crust is largely composed of basaltic igneous rocks which are covered by a thin veneer of sediments which are thickest near the margins of the continental landmasses. The continental crust is much thicker and older. The continental crust is also much more variable and structurally very complex. Virtually all the rock types known to man occur in the continental crust. Even meteorites, xenoliths from the mantle, and ophiolites (fragment of former oceanic crust) are constituents of the continental crust because that’s where we found them.
Roughly three fourths of the continental crust is covered by sedimentary rocks and almost all of it is covered by loose sediments (soil, sand, dirt, etc.). We are most likely to encounter these materials, but it is important to understand that despite being so ubiquitous on the surface, they make up only about 8% of the whole mass of the crust. Sediments consolidate to sedimentary rocks after burial. Sand turns to sandstone, limy mud to limestone, clay to claystone. Sedimentary rocks are stable only in the upper parts of the crust. High pressure and temperature in the deeper parts metamorphoses them (minerals recrystallize) to various metamorphic rocks. The bulk of the continental crust is made of metamorphic rocks. Igneous rocks are also common on the surface in volcanically active regions, but they also occur deeper in the crust as granitic (mostly) intrusions.
Important sediments are sand, clay, mud (wet mixture of clay and fine sand), and limy mud. Widespread sedimentary rocks are limestone (2% of the crust by volume), sandstone (1.7%), claystone (4.2%) which are lithified versions of the loose sediments mentioned before. Chemical sediments like halite and gypsum are important as well, but their overall volume is clearly less than 1% of the crust. Important igneous rocks are granite, granodiorite, gabbro, basalt, diorite, andesite, etc. It is very difficult to say what is the percentage of these rocks. Important metamorphic rocks are metamorphosed equivalents of widespread sedimentary and igneous rocks. Common metamorphic rocks are slate (metamorphosed claystone), schist (met. claystone, higher grade than slate) quartzite (met. sandstone), marble (met. limestone), gneiss (met. igneous rock or sedimentary rocks), amphibolite (met. basaltic rocks).
Gypsum is an evaporite mineral. Evaporites are water-soluble chemical sediments that crystallize out of concentrated (high salinity) seawater in lagoons. 

Sunday, 3 August 2025

My School Education and Service

 

Tukaram Kumbar:

I had my primary education in NTMS Kheni Ranjol, and my secondary education in TDB High School Kheni Ranjol. Passed the seventh board exam with 90% marks in mathematics. Passed SSLC in first class with 67% marks in 1969. I was a topper in my class. Lost my father when I was a ninth class student. my child marriage was held after my matriculation exam. Then I joined BVB College Bidar for one one-year PUC Science course. And continued my education for a three-year Science degree. Earned my B.Sc. degree with Mathematics and Physics as optional subjects, in 1973 summer.


My first learning in Ranjol:

I was born in 1951, on the Dasara Mahanavami day, in Hochaknalli village.  My father Gundappa was a potter. He was a very active personality and a hard worker.  He loved me, his only son too much, and he was dreaming of sending his son Tukaram, to school, so that his son would learn reading and writing skills. Olden days did not have schools in the villages of this region.

In 1960, my uncle Vithal who was a fifth-class student, asked me to come to School with him to Ranjol. I accompanied my uncle to NTMS Ranjol-Kheni. It was the first week of June and it rained during night hours. There was fresh rainwater in the open grounds of the school. The monsoon rains filled the air with delighting breath. I was admitted to the first standard and asked to sit with students in the last room. I attended this school for about our months. I learned basic alphabets and mathematical tables.

After this,  A new school was opened in my village with a single teacher. There was no school building, and I was asked to attend this new school. The school was run from a private building and the classes were arranged in a Patel's house. The school strength was about eight boys including me. The age group of boys was about seven to nine years. There was a single textbook for the first standard. I mastered reading the book within the first half of the year. During the second half, I completed reading the second standard book. Mathematics was taught on a slate. By the end of the year, It was declared that I passed the second standard.  

Kheni Ranjol was a neighboring big village, with a government New Type Middle School (NTMS). It was the only school in the neighborhood and boys from many nearby villages used to study there. Next year I was admitted to third standard at NTMS Ranjol Kheni.

For my admission at Ranjol, one Mr. Basavanthrao Police Patil accompanied my father to the school. While admitting me, the school authorities insisted that I should join for the second standard. But the Patel wanted me to be admitted to the third standard. They tested my maths skills by giving me an assignment, a subtraction problem. I solved it wrongly. So after much discussion, they concluded that they would allow me in the third standard for the first three months. If I failed the quarterly exam, I had to go back to the second standard. If I cleared the quarterly examination, I may continue to the third standard. I cleared the quarterly exam. Not only that, I emerged first to the class, in the annual examination. 

The school was about 1.25 km away from my village and I walked up and down on school days. But the school days were too difficult for four months of the rainy season, and I used to carry a plastic cover to protect myself from rain. After 4-30 pm when we were released to go to our homes, I used to walk barefoot, and on several occasions, rain chased me and I was fully wet, except my books and notebooks.

Mr. Basavanappa S was our headmaster. He was a very disciplined personality and a good timekeeper. One Mr. Gurubasappa was my mathematics teacher. I was very much impressed by his way of explaining mathematics principles. Mr. Gurubasappa was the main person to shape my character. Right from third to seventh standard, he taught me in the classrooms. Any topic he taught was impressive and was fully crystal clear; whether it be poetry, prose, or mathematics; it would be fascinating. 

I was very lucky to have such a dedicated teachers’ team and a well-built school with plenty of space for a playground. Football and valley ball were my favorite sports. From third standard to seventh standard, I was the topper in my class and always stood first among my classmates.  

During the academic year 1965-66, I passed the 7th board exam with 90% marks in mathematics. This was the subject that I loved a lot and used to spend time, solving problems of simple interest, and problems related to ratios and proportions. In 1969, I passed the 10th board, the SSLC exam, in first class, with 67% marks.

I lost my dear father in 1967 October. It was a suicide. He was cheated in a land acquisition case.  My mother was my guardian. She was sick and there was no one to support us financially. My mother was thinking about my future and she decided to conduct my marriage, though I was still a boy. In the first week of June 1969, my marriage was conducted at Srimandal village, near Janawada. The In-laws gave me a10 gram gold ring. The Srimandal village was on the banks of the Manjara River, which separated Telangana from Karnataka state.

My college education:

Though I had no money, I was dreaming of going to college for higher education. I sold 10g gold that was offered in my marriage and secured admission to the BVB College Bidar as a PUC Science student in June 1969. It was the only college in Bidar city. To start with, I became a roommate of my brother-in-law, Shri Gundappa Srimandal who was a BA final-year student. We used to cook our daily food. I had no money to get textbooks. Things were not that much easy. Spent six months of PUC Science without reference books on basic physics. Yet I stood second to my college in the final PUC exam.

Passed the one-year PUC Science, with 58% marks, in 1970 summer. I was the second topper in my PUC batch. Out of 300 students, only 90 students got through the one-year pre-university course.

I was awarded free-ship, after my PUC Science results, and the money that I paid to the college as a tuition fee was refunded. This same money, I used for next year's admission fee for B.Sc. part-one course.  Then I applied for the National loan scholarship and was selected for this. I was awarded the National loan scholarship for my entire graduation period with a 4% simple interest. I used to get 720 rupees per year. I could purchase relevant textbooks and medicine for my ailing mother. She was infected by TB.

In 1972 there was a drought, and surviving was a problem. I was in my degree final year. I also did not receive the scholarship installment amount for the 1972-73 year. I borrowed 200 rupees from a relative called Mukund Sultanpur to pay the college tuition fee. For my daily food needs at Bidar, my Grandmother Narasamma gave her (a 4-gram) nose ring. I sold it to live in Bidar, till the final year degree exam was conducted in the summer.

Passed B.Sc. in the second division with 56% marks in the 1973 summer. Thus I completed my science degree from Karnataka University. Mathematics and Physics were my optional subjects. 

Just after my degree exam, I was asked to take "summer coaching" to the children of Mali-Patel, Mr. Shamrao of Rekulagi Village. I worked as a tutor for a month in his home. Patil Shamarao gave me some food grains that I needed to survive the famine. Survival was a challenge due to famine in this region.

Then, I worked as a literate mazdoor in the PWD division office Bidar, in a famine relief fund. We (my mother and wife) survived on this little pay of Rs 100/- per month, for almost five months in 1973.

----------------------------------------------

Tukaram Kumbar:

(A summary of my education)

I was born in 1951, on the Dasara Mahanavami day, in Hochaknalli village. Olden days did not have schools in villages. In 1960, my uncle Vithal asked me to come to School with him to Ranjol. He was a student of the fifth standard. I was admitted to the first standard in Kheni Ranjol. After about four months, a new school was opened in my village with a single teacher. I was asked to attend this new school. There was a single book for the first standard. I mastered reading the book within the first half of the year. During the second half, I completed reading the second standard book. It was declared that I passed the second standard. 

Next year I was admitted to third standard at NTMS Ranjol Kheni. The school was about 1.25 km away from my village and I walked up and down on school days. From third standard to seventh standard, I was the topper in my class and always stood first in merit among my classmates. During the academic year 1965-66, I passed the 7th board exam with 90% marks in mathematics. Both my parents Gundappa andTippamma were illiterate.

I joined TDB High School in Kheni-Ranjol itself. I was awarded a fifty rupee merit scholarship. But I lost my dear father in October 1967, when I was a ninth-class student. It was a suicide. He was cheated in a land acquisition process. In 1969, I passed the 10th board, the SSLC exam, in first class, with 67% marks. My child marriage was conducted at Srimandal village with Sharanamma, in the first week of June 1969.

I was dreaming of going to college for higher education. I sold 10g gold that was offered in my marriage and secured admission to the BVB College Bidar as a PUC Science student in June 1969. I Passed the one-year PUC Science, with 58% marks in 1970 summer. I was the second topper in my PUC batch. Out of 300 students, only 90 students got through the annual board exam, the one-year pre-university course.

On my merit and poor financial conditions, I was awarded the National loan scholarship for my entire graduation period with a 4% simple interest. I used to get 720 rupees per year. I Passed my B.Sc. in the second division with 56% marks from Karnataka University in the 1973 summer. Mathematics and Physics were my optional subjects in the degree. 

My appointment in the P and T Department:

I applied for a telephone operator’s job in the Posts and Telegraphs department, in response to a paper advertisement. The Posts and Telegraphs department recruited me as a telephone operator on a merit basis. After two months of induction training at Gulbarga, they posted me at Bhalki telephone exchange as a telephone operator. And this was the turning point in my life, as I could live independently on my earnings. My first salary was Rs 317 per month.

 After completing four years of service, as a telephone operator, I applied for a departmental competitive examination, for the post of Phone Inspector. My degree subjects were mathematics and physics, and these helped me in my competitive examination. I cleared the "Phone Inspector" exam just by reading for a few days. After six months of training at RTTC Hyderabad, I was posted as a Phone Inspector at Sandur telephone exchange, in the Hospet Sub Division. It was 1980 when I was living in Sandur with my family. By then, I had two kids. I was the in-charge officer of the Sandur telephone exchange. It was a manual telephone exchange with a CBNM switchboard. Donimalai Auto Exchange was parented to this Sandur telephone exchange.

while at Sandur, I started preparations for the competitive exam for the post of ‘Junior Engineer’. This time studied well in advance, and I was ready to face the examination. Applied for the post, when called for; appeared for this examination at Bellary Centre, and I was selected for the ‘Junior Engineers’ post, this time, from the Bellary division. I did not believe the news of my selection to a higher level. I was the happiest man on that day. then, I underwent a fourteen-month training course at RTTC Trivandrum, in Kerala, during 1982-1983.

I served almost twelve years at Raichur and most of the service was on the external plant, the cable network.

In 1996 I was transferred to the Bidar district when the C-DOT XL digital exchange switch was installed recently at Bidar. A lot of external work was pending and I planned and implemented the plan with the cooperation of controlling officers. I too was promoted to TES Group B Officer's post in 1999 on seniority. I worked as a commercial officer in the TDM office in Bidar for one year. Then on regular absorption, I was posted as S.D.O. Phones Bidar.

My School and Service


                   My school  and service                                           
Tukaram Kumbar B. Sc.
During the year 1960, my uncle Vithal used to go to primary school at Ranjol kheni. He invited me to join the school at Ranjol, as there was no school in our village Hochaknalli. One day, after consulting my grandmother, I followed Vithal to school.  I was admitted to the first standard in NTMS Ranjol Kheni. It was the first week of June and it rained during night hours. There was fresh water in the open grounds of the school.
The building was L-shaped and it was a concrete building. I was impressed by the modern way of new buildings constructed outside the village of Ranjol kheni. This place was about one kilometer away from my residence at Hochknalli. We used to walk barefoot to school on a narrow mud road. This was a modern school situated in the Centre of about ten villages. Boys from different villages used to study here. The surrounding villages were Rekulgi, Mangalgi, Talmadagi, sitalgeri, Hajjargi, sirkatnalli, etc. One Mr. Gurubasappa was my class teacher for the first standard. He was a young and fresh teacher, who used to teach mathematics. By the time I finished first term, a new teacher was posted in my village. And therefore I was asked to join new school in my own village Hochaknalli. I did so and learned the alphabet. The strength of students was limited to around ten boys of similar age groups. Among these students, two of us started reading the first standard book and we two completed this textbook and were given a second standard book in the same academic year to study. So by the end of the year, we were declared passed the second standard.
The next year I was again sent to Ranjol Kheni in order to admit me to third standard. The old class teacher Mr. Gurubasappa identified me and he did not agree with the proposal as I was a first standard student in that school during the previous year. He asked me to solve a small problem on subtraction, and I did it with a wrong answer. There was an agreement among the teachers and my parents that I would be admitted to the third standard, and if I failed the quarterly examination, I would have to go back to the second standard only. If I get through, I shall continue in the third standard. I got through the quarterly examination and in the final exam I stood first in my class. After that, I used to be the topper in my class up to SSLC.
I got through SSLC in the first class in 1969 April. I was the fifth student to get an SSLC pass from my village after Indian independence. Mr. Shivareddy, Shankar Reddy, Hemreddy D, and Hemreddy S were my seniors from my village. I was asked to marry a girl from a far-off village Srimandal in the summer vacation after the SSLC exam. It was a child marriage. I lost my dear father when I was a 9th student. It was a great loss as the family lost a bread-earning member, unexpectedly. My father was a potter and active member of the village. My grandmother was the head of the family. We used to talk Telugu in our home. Most of our relatives were from Telangana.
Gundappa kumbar: my father,
Tippamma kumbar: my mother,
Narasamma kumbar: grandmother;
                       
   
After SSLC, I joined a science college at Bidar and got through pre pre-university course in science in 1970.
Thereafter I continued my education with the help of a National loan scholarship and completed my BSc in 1973. I studied mathematics and Physics as my optional subjects.
I was appointed as a telephone operator in 1974 and was posted to Bhalki. Worked at Bhalki for five years [1979] and wrote a competitive examination for the post of telephone inspector and was selected.
I underwent six-month training at RTTC Abids Hyderabad. Then I was posted to Sandur in Bellary district as a Phone inspector. I was the officer in charge of the telephone exchange at Sandur.  Sundur manganese and iron ores was a famous ore company managed by M. Y. Ghorpade, the Maharaja of Sandur.
Worked here for one year 1980-81, and again wrote the competitive exam for the post of Junior Engineer and was selected. I underwent one year of training at RTTC Trivandrum Kerala and was posted to Raichur Telephones, as a Junior engineer in 1983-84. It was a long stay at Raichur for twelve years.
I migrated to Bidar in 1996 on mutual transfer. In 1999, I was selected for the post of Sub-divisional Engineer and worked as S.D.O.Phones, at Bidar till my retirement in 2009 February.
During 34 years of service, I saw a lot of up gradations in the department; from manual to automatic system of call switching. I have seen Vigorous expansions of telephone networks in India. After 1990 the systems were digitalized all over the country. Call switching was on STD. customer could dial to anybody at any instant of time all over the nation.

After 2000 mobile networks were installed all over the nation by many companies on liberalization to private operators. Telephony became cheaper and affordable to the common man. Nowadays more than 50% population owns a mobile set.

photosynthesis



Photosynthesis

The Light dependent reactions:
 A light-dependent series of reactions which occur in the grana, and require the direct energy of light to make energy-carrier molecules that are used in the second process:
  • light energy is trapped by chlorophyll to make ATP (photophosphorylation)
  • at the same time water is split into oxygen, hydrogen ions and free electrons:
    2H
    2O --->  4H+ + O+ 4e- (photolysis)
  • the electrons then react with a carrier molecule nicotinamide adenine dinucleotide phosphate (NADP), changing it from its oxidised state (NADP+) to its reduced state (NADPH):
    NADP
    + + 2e- + 2H+  -->  NADPH + H+

An electron transfer system (a series of chemical reactions) carries the two electrons to and fro across the thylakoid membrane. The energy to drive these processes comes from two photosystems:
  • Photosystem II (PSII) (P680)
  • Photosystem I (PSI) (P700)


In the first photosystem (Photosystem II, PSII):
  • photoionisation of chlorophyll transfers excited electrons to an electron acceptor
  • photolysis of water (an electron donor) produces oxygen molecules, hydrogen ions and electrons, and the latter are transferred to the positively-charged chlorophyll
  • the electron acceptor passes the electrons to the electron transport chain; the final acceptor is photosystem PSI
  • further absorbed light energy increases the energy of the electrons, sufficient for the reduction of NADP+ to NADPH
The oxidised form of nicotinamide adenine dinucleotide phosphate (NADP+)

The reduced form of nicotinamide adenine dinucleotide phosphate (NADPH)

  
Light reactions occur mostly in the thylakoid stacks of the grana. Here, sunlight is converted to chemical energy in the form of ATP (free energy containing molecule) and NADPH (high energy electron carrying molecule). Chlorophyll absorbs light energy and starts a chain of steps that result in the production of ATP, NADPH, and oxygen (through the splitting of water). Oxygen is released through the stomata. Both ATP and NADPH are used in the dark reactions to produce sugar.

Dark reactions occur in the stroma. Carbon dioxide is converted to sugar using ATP and NADPH. This process is known as carbon fixation or the Calvin cycle. The Calvin cycle has three main stages: carbon fixation, reduction, and regeneration. In carbon fixation, carbon dioxide is combined with a 5-carbon sugar [ribulose1,5-biphosphate (RuBP)] creating a 6-carbon sugar. In the reduction stage, ATP and NADPH produced in the light reaction stage are used to convert the 6-carbon sugar into two molecules of a 3-carbon carbohydrate, glyceraldehyde 3-phosphate. Glyceraldehyde 3-phosphate is used to make glucose and fructose. These two molecules (glucose and fructose) combine to make sucrose or sugar. In the regeneration stage, some molecules of glyceraldehyde 3-phosphate are combined with ATP and are converted back into the 5-carbon sugar RuBP. With the cycle complete, RuBP is available to be combined with carbon dioxide to begin the cycle over again.





The biochemical conversion of CO2 to carbohydrate is a reduction reaction that involves the rearrangement of covalent bonds between carbon, hydrogen and oxygen. The energy for the reduction of carbon is provided by energy rich molecules that are produced by the light driven electron transfer reactions. Carbon reduction can occur in the dark in and involves a series of biochemical reactions that were elucidated by Melvin Calvin, Andrew Benson and James Bassham in the late 1940s and 1950s. Using the radioisotope 14C, most of the intermediate steps that result in the production of carbohydrate were identified. Calvin was awarded the Nobel Prize for Chemistry in 1961 for this work