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The Columbia Plateau in Washington and Oregon is ________.

Peat is thought to be the original material from which coals are formed.

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

Which of the following shoreline features forms only in tectonically active areas?

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

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 ________.

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 ________.

Which characteristic is absolutely necessary for a sedimentary rock to have potential as a possible reservoir rock for oil or gas?