4. Give reasons.
(i) We cannot go to the centre of the earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble.
(i) What are the minerals most commonly used in the following objects?
(ii) Identify some more objects made up of different minerals.
Answers
Answer:
(i) To reach the centre of the earth one will have to dig a hole 6000 6000km deep on the ocean floor. This is quite impossible and therefore we cannot go to the centre of the earth.
Explanation:
i)Coal, limestone, manganese ore, bauxite, copper ore, dolomite, fire clay, slate pyrophyllite-diaspore are the main minerals occurring in the State. Besides these minerals, the state is fast emerging as a dimensional stone producer. The State is blessed with favourable geological and geotectonic settings.
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Answer:
To reach the centre of the earth one will have to dig a hole 6000 6000km deep on the ocean floor. This is quite impossible and therefore we cannot go to the centre of the earth.
(ii) Rocks break down into small fragments known as sediments. These sediments are transported and deposited by wind, water, etc. These loose sediments are compressed and hardened to form layers of rocks known as sedimentary rocks.
(iii)Limestone is changed into marble as a result of metamorphism under great heat and pressure.
(i) the minerals mainly used are heat
(ii) some more are sediments , ocean , wind , water , air etc