Basaltic lavas are generally hotter and more viscous than andesite lavas.

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

The crust, mantle, and outer core are solid.

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

The distance between a seismological recording station and the earthquake source is determined from the ________.

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

The movement of water within the surf zone that parallels the shore is termed ________.

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

The Columbia Plateau in Washington and Oregon is ________.

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