Question

Rapid cooling in molten, extrusive materials makes the resulting materials ________.

1) dense
2) hard
3) fine-grained
4) large-grained
5) soft

Answer 1

Rapid cooling of molten, extrusive material resulting materials fine-grained The correct answer is 3.

Step-by-step explanation:

Rapid cooling in molten, extrusive materials makes the resulting materials fine-grained. Extrusive igneous rocks are formed when magma reaches the earth's surface and cools rapidly. Some key characteristics of these rocks are that they lack time for large crystals to grow, resulting in a texture that is very fine grained. Conversely, intrusive igneous rocks, which cool slowly inside the earth, form coarse-grained textures with larger mineral grains. The correct answer is 3.