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NCERT Class 7 Geography: Chapter 2, Question Give reasons Q.4
(i) We cannot go to the centre of the earth.
(ii) Sedimentary rocks are formed from sediments.
(iii) Limestone is changed into marble.
(i) We cannot go to the centre of the earth because the it has very high temperature and pressure and lies 6000 km below the ocean floor. We will not able to survive there because there is no oxygen or favourable conditions.
(ii) Sedimentary rocks are formed from sediments because of extreme compression and hardening of the particles of sediment which are transported and deposited by wind, water etc.
(iii) Limestone is changed into marble because of extreme heat and pressure as it is a sedimentary rock.
https://www.indcareer.com/schools/ncert-solutions-for-7th-class-geography-chapter-2-inside-our-earth/