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________ are glacier-cut valleys that flooded as sea level rose in post-glacial times.

________ is the dominant feldspar in basalt.

Which rock type most suggests possible deposition by energetic mountain streams?

The bottom or downward tip of a crevasse marks the ________.

________ are erosional features produced by valley/alpine glaciers.

________ is the dominant feldspar in basalt.

________ magma is the most abundant type of erupted at oceanic spreading centers.

Deep, down-faulted structures along the axis of some segments of oceanic ridge are called ________.

Which rock type most suggests possible deposition by energetic mountain streams?

All of the following are possible steps of scientific investigation EXCEPT for ________.