Muscovite, biotite, and chlorite are common minerals found in phyllites and schists.

Aa flows are generally thinner and have smoother surfaces than pahoehoe flows.

Which statement concerning sedimentary rocks is NOT true?

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

The Columbia Plateau in Washington and Oregon is ________.

Longshore sand transport and longshore currents depend on waves impinging ________ to a shoreline.

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?