question number 2 of 40 - earth science some extrusive igneous rocks, such as obsidian, are glassy because…

question number 2 of 40 - earth science some extrusive igneous rocks, such as obsidian, are glassy because they - cool rapidly contain water are made of only one mineral have low melting points

question number 2 of 40 - earth science some extrusive igneous rocks, such as obsidian, are glassy because they - cool rapidly contain water are made of only one mineral have low melting points

Answer

Brief Explanations:

Extrusive igneous rocks form on the Earth's surface. When magma reaches the surface, it cools very quickly. Rapid cooling prevents the formation of large - sized crystals, resulting in a glassy texture like in obsidian. Water content, single - mineral composition, and low melting points are not the main reasons for the glassy texture.

Answer:

F. cool rapidly