Which of the following high silica igneous rocks can be of low enough density to float on water?
A)pumice
B)granite
C)rhyolite
D)obsidian

Question

Quizplus · Accepted Answer

Pumice is a high silica igneous rock that can have a low enough density to float on water, due to the presence of numerous gas bubbles within the rock. Granite, rhyolite, and obsidian are all high silica igneous rocks but are generally too dense to float on water.

Which of the Following High Silica Igneous Rocks Can Be