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

The eruptions of the Hawaiian volcanoes may be described as explosive in comparison to the 1980 Mount St. Helens eruption.

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

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

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

________ are fossil dung and stomach contents.

Which statement about the May, 1980, eruption of Mount St. Helens is FALSE?

How are sand grains transported by the wind?

________ lava, commonly erupted along oceanic ridge systems, originates by partial melting of mantle peridotite.

The eruptions of the Hawaiian volcanoes may be described as explosive in comparison to the 1980 Mount St. Helens eruption.