________ is thought to form by partial melting and in situ crystallization of the melted portion.

________ is thought to form by partial melting and in situ crystallization of the melted portion.

________ destroyed the city of St. Pierre, Martinique in 1902.

The mantle is composed mainly of metallic iron with small amounts of magnesium silicate minerals.

________ destroyed the city of St. Pierre, Martinique in 1902.

The large mineral grains in a porphyritic igneous rock are called ________.

Which statement concerning sedimentary rocks is NOT true?

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

Basaltic lavas are generally hotter and more viscous than andesite lavas.

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