GEOLOGY

Detailed explanation-1: -Explanation: Option : B. Crystals are fine grained. When magma makes its way to its surface as lava and then cools forming rocks it is called extrusive igneous rock and it is fine grained a it quickly cools down.

Detailed explanation-2: -Igneous rocks are rocks formed from the crystallization of a liquid (molten rock). Igneous rocks may be divided into two categories. Intrusive or plutonic rocks crystallize from magma beneath the earth’s surface. Extrusive or volcanic rocks crystallize from lava at the earth’s surface.

Detailed explanation-3: -Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.

Detailed explanation-4: -igneous rocks are also called volcanic rocks. They cool from magma slowly in the crust.

Detailed explanation-5: -intrusive rock, also called plutonic rock, igneous rock formed from magma forced into older rocks at depths within the Earth’s crust, which then slowly solidifies below the Earth’s surface, though it may later be exposed by erosion.