When did the first abundant fossil evidence appear?

The main goal of paleoclimatology is to understand the climate of the past in order to ________.

Dissolved gases may comprise up to a few percent by weight of a magma.

You come upon a series of folded sedimentary strata in the field. Which principle can you use to determine that they must have been disturbed after their deposition?

In 1980, ________ was the first Cascade Range volcano to erupt since Mt. Lassen, California, in 1915-16.

Smooth, rounded cobbles and pebbles are found in streams a result of ________.

When a(n) ________ is emitted, the mass number of the isotope is reduced.

Which one of the following is TRUE regarding tsunamis?

In 1980, ________ was the first Cascade Range volcano to erupt since Mt. Lassen, California, in 1915-16.

Which one of the following is TRUE regarding tsunamis?