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

A(n) ________ is not a fundamental particle found in atoms.

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

The main difference between conglomerate and breccia is ________.

Mud cracks in a shale or mudstone indicate that the mud or clay was deposited in deep waters of an offshore marine environment.

Which sedimentary structure indicates the depositional environment involved the drying out of fine grained sediments?

Decompression melting occurs because of ________.

Which sedimentary structure indicates the depositional environment involved the drying out of fine grained sediments?

Which sedimentary structure indicates the depositional environment involved the drying out of fine grained sediments?

Kilauea and Mauna Loa are ________.