Question

What features did you use to classify igneous rocks as extrusive or intrusive?

a) "Color and texture"
b) "Texture and grain size"
c) "Grain size and chemical composition"
d) "Chemical composition and color"

Answer 1

The features used to classify igneous rocks as extrusive or intrusive are color and texture. Igneous rock composition refers to the minerals present, while texture refers to features such as mineral grain size.

Step-by-step explanation:

The features that are used to classify igneous rocks as extrusive or intrusive are color and texture.

Igneous rock composition refers to the minerals present in the rock, while texture refers to the features observed, such as the sizes of the mineral grains or the presence of holes.

For example, rocks with large grains are called intrusive or plutonic rocks, and rocks with small grains are called extrusive or volcanic rocks.