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

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

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

The main difference between conglomerate and breccia is ________.

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

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

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

________ 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.

What instrument is used to record earthquake vibrations?