Question

Exercises

1. Answer the following questions.
(1) What are the three layers of the earth?
(ii) What is a rock?
(iii) Name three types of rocks.
(iv) How are extrusive and intrusive rocks formed
(v) What do you mean by a rock cycle?
(vi) What are the uses of rocks?
(vii) What are metamorphic rocks?​

Answer 1

i : the inner core, the outer core, the mantle and the crust
ii : a rock is a naturally occurring solid mass of minerals.
iii : sediment, metamorphic and igneous
iv : Extrusive rocks are produced when magma cools above the earth's surface. intrusive rock forms when magma is trapped deep inside of the earth
v : the rock cycle is the transformation over time of sedimentary, metamorphic and igneous rocks
vi : cosmetics, cars, roads, and appliances
vii : metamorphic rocks come from the transformation of existing rock to other types of rock called metamorphism