Answered

How do igneous rocks form?

ACompaction and cementation of sediment
BCooling of molten lava or magma
CHeating and added pressure to existing rock
DEvaporation of seawater

Verified Answer :

CHeating and added pressure to existing rock.
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Answer:

C. Cooling of molten lava and magma

Explanation:

The rocks under the surface of earth are heated at very high temperatures. They melt at these high temperatures and create magma. Magma composition depends upon the elements of the parent rocks. It also contains gases. The elements of earth crust are main elements of magma. When this magma is cooled and hardened, igneous rocks are produced. The formation of these rocks depends upon the following factors:

i) Temperature  

ii) Pressure  

iii) Water

iv) Parent rock composition