Question

How are igneous rocks formed?

They are formed from cooled magma.

They are hot magma the moment it is expelled from a volcano.

They are formed over many years of pressure and heat within Earth.

They are formed from sediments that collected in ocean beds.

Answer 1

What are igneous rocks?

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface. Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies