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

The half-life of carbon-14 is about 6000 years. Assume that a sample of charcoal formed by burning of living wood 15,000 years ago. How much of the original carbon-14 would remain today?

________ has the same mineral composition as andesite.

When a permanent stream enters a desert area, what happens to its discharge?

Continental crust is generally thicker than oceanic crust.

________ occur at about the time of the first quarter and third quarter phases of the Moon.

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.