Question

What are the two parts of the crust? what is the basis that of classification?

Answer 1

The two parts of the earth's crust are oceanic, continental. Oceanic and Continental crusts both shift and move.

Their composition is however different. Since the continental crust is made of granite and is less dense than the oceanic crust, they are a bit elevated.

WHereas, the oceanic crust is denser than the continental crust. It is made of basalt rock.

Answer 2

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◇Elements in the Earth’s Crust:

The earth is composed of various kinds of elements.About 98% of the total crust is made up of eight elements as oxygen, silicon, aluminium, iron, calcium, sodium, potassium, and magnesium.The rest is constituted by elements like titanium, hydrogen, phosphorous, manganese, sulphur, carbon, nickel and others.The elements in the earth’s crust are rarely found exclusive but are usually combined with other elements to make various substances.


◇Minerals in the Earth’s Crust:

A mineral is a naturally occurring organic or inorganic substance, having an orderly atomic structure and a definite chemical composition and physical properties.A mineral is composed of two or more elements. But, sometimes single element minerals like sulphur, copper, silver, gold, graphite, etc are also found.The basic source of all minerals is the hot magma in the interior of the earth.When magma cools, crystals of the minerals appear and a systematic series of minerals are formed in sequence to solidify so as to form rocks.