Question 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.
Answers
Answer:
Answer: Since the temperature and pressure increase enormously as we go deeper and deeper inside the earth, we cannot go to the centre of the earth. Sedimentary rocks are formed from sediments. ... Answer: Because of extreme heat and pressure, limestone undergoes a change in its form and turns into marble.
Explanation:
Ans. 1. We cannot go to the centre of the earth. Answer: Since the temperature and pressure increase enormously as we go deeper and deeper inside the earth, we cannot go to the centre of the earth. ... Answer: Because of extreme heat and pressure, limestone undergoes a change in its form and turns into marble.
2. Ans - Since the temperature and pressure increase enormously as we go deeper and deeper inside the earth, we cannot go to the centre of the earth. Sedimentary rocks are formed from sediments. Answer: Because of extreme compression and hardening of the particles of sediment which are deposited by wind, water etc.
3. Ans - Marble is a metamorphic rock formed by the alteration of limestone by heat and pressure. The calcite in the limestone changes and fossils and layering in the original limestone disappear as interlocking grains grow. If the limestone is pure, a white marble is formed.
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