Question

Give reasons.

(i) We cannot go to the center of the Earth.

(ii) Sedimentary rocks are formed from sediments.

(iii) Limestone is changed into marble.

Answer 1

(i)The center of the Earth, lying about 6000 km from the ocean floor, is characterised by extremely high temperature and pressure which is fatal to human existence thus non visit-able.

(ii)When big rocks break down into small fragments (or sediments), the fragments are transported and deposited by factors like water and wind. The loose sediments compress and harden over the years to form layers and layers of rocks.

(iii)Limestone, a sedimentary rock, when subjected to conditions of extreme heat and pressure gets converted into marble, which is a metamorphic rock.