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Rocks in the earth's crust are created through a variety of dynamic processes involving heat, pressure and mineral composition.

Nature of Rocks:

(i) Have generally uniform mineral composition

(ii) Can be light coloured (gnarth) a dark coloured (by gravity)

(iii) May have small grains or large grains depending on rate of cooling of magma/lava

(i) Comprising various different minerals found

(i) Show banding effect - alternate layers of minerals

(ii) Show lineation & foliation characteristics

Origin:

Formation processes:

Hence, rock cycle occurs in leading to creation, destruction & recreation of rocks.