Question

(c) Give a reason for each of the following:
(i) Igneous rocks also called the primary rocks.
(ii) Igneous rocks are used by builders and sculptors
(ii) Sedimentary rocks are called secondary rocks.

d) Define different types of igneous rocks on the basis of their chemical composit (d)


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Answer 1

Answer:

Igneous rocks also called the primary rocks as they form the basis of formation of other types of rocks.

(ii) Igneous rocks are used by builders and sculptors because these rocks are easily available, economical, and feasible in nature. These rocks are very strong, which is considered the best option for the construction of strong structured statues and buildings.

(iii) Sedimentary rocks are called secondary rocks because they are formed by the solidification of sediments of original igneous, sedimentary or metamorphic parent rocks.