Which one of the following statements is NOT true?

Approximately how much more energy is released in a 6.5 Moment Magnitude earthquake than in one with Mw of 5.5?

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

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

________ 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 ________.