Consider the following statements regarding rocks and identify the correct one s 1 Ig...........

Geography Earth Geology

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Consider the following statements regarding rocks and identify the correct one/s.

1. Igneous rocks are primary rocks and are rich in fossils.

2. Coal is a sedimentary rock.

3. The continental crust is made up of heavy basaltic rocks and the oceanic crust is made of lighter granite rocks.

Select the correct answer using the codes given below

1 and 2 only

3 only

2 and 3 only

2 only

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Explanation:

Igneous rocks are primary rocks as they are formed first in the rock cycle by solidification of magma. It is from these rocks only that metamorphic or sedimentary rocks are formed. But these rocks are rich in metallic minerals and not in fossils. This can be judged from the fact that all the lava plateaus and shield regions of world are rich in metallic minerals and devoid of fossil fuels. For eg- Canadian Shield, FennoscandianShield, Deccan plateau etc.

Coal is a sedimentary rock formed by accumulation of vegetative matter in between rock layers.
The oceanic crust is made up of heavy basaltic rocks while the continental crust is made up of lighter granitic rocks and it overlies the heavier oceanic crust.