Rhyolite, andesite, basalt, and obsidian are all rocks that are classified as ________.
A) metamorphic and foliated
B) metamorphic and unfoliated
C) igneous and intrusive
D) igneous and extrusive
E) sedimentary and clastic

Question

Quizplus · Accepted Answer

Rhyolite, andesite, basalt, and obsidian are all igneous rocks that form as a result of cooling and solidification of magma or lava. They are classified as extrusive igneous rocks because they form when magma or lava flows out onto the Earth's surface and cools quickly, resulting in fine-grained crystals or glassy textures.

Rhyolite, Andesite, Basalt, and Obsidian Are All Rocks That Are