The crust, mantle, and outer core are solid.

What percent of Earth’s land surface is currently covered by glaciers?

Vents that emit only heated, volcanic gases and water are called fumaroles.

Which statement concerning sedimentary rocks is NOT true?

________ is a major dissolved volatile constituent in both magmas and volcanic gases.

Which was the most powerful, explosive volcanic eruption of historic time?

Amphibolite is a foliated metamorphic rock composed principally of hornblende and plagioclase. It forms ________.

The first stage in the formation of coal involves a substance composed of partially altered plant material called ________.

What percent of Earth’s land surface is currently covered by glaciers?

Parallel, straight, linear imperfections visible on the cleavage surfaces of plagioclase feldspar are called ________.