Define rocks and name their types on the basis of mode of formation.
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Answer:
About rock
A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere.
Types of rock
These classes are
(1) igneous rocks, which have solidified from molten material called magma;
(2) sedimentary rocks, those consisting of fragments derived from preexisting rocks or of materials precipitated from solutions;
(3) metamorphic rocks, which have been derived from either igneous or sedimentary rocks under ...
n any natural mass of mineral matter that makes up the earth crust is called a rock the earth crust is made up of various types of rocks of different texture size and colour.
Rocks are three types are :
1. igneous rocks
2. sedimentary rocks
3. metaphormic rocks