A type of igenous rock forming from the cooling of magma within the earth's crust is called_____.

a) intrusive
b) sedimentary
c) metamorphic
d) extrusive
e) volcanic

a

Right.

The correct answer is a) intrusive.

To find the answer, we need to understand the different types of rocks that form from the cooling of magma within the Earth's crust. There are two main types of igneous rocks: intrusive and extrusive.

Intrusive igneous rocks form when magma cools slowly beneath the Earth's surface. This slow cooling allows for the formation of large mineral crystals, giving the rock a coarse-grained texture. Examples of intrusive igneous rocks include granite and diorite.

Extrusive igneous rocks, on the other hand, form when magma erupts onto the Earth's surface and cools quickly. This rapid cooling does not allow for the growth of large crystals, resulting in a fine-grained or glassy texture. Examples of extrusive igneous rocks include basalt and obsidian.

From the given options, the correct answer is "a) intrusive" because it specifically refers to igneous rocks that form from the cooling of magma within the Earth's crust.