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The Atacama of Chile is a desert primarily because it is located ____________.

Coastal region deserts are most likely near ocean currents that flow ____________.

The fact that snow and ice are increasing in Antarctica poses a serious problem for the validity of the global warming hypothesis.

Solidified fragments of volcanic material ejected into the air are called

An igneous rock was formed with 8000 radioactive (parent) atoms but contains only 1000 radioactive (parent) atoms today. If the half-life for the radioactive element is 10 million years, the rock is ___ million years old.

Which of the following is LEAST likely to signal an impending volcanic eruption?

Bombs, ash, and cinders are all examples of ____.

The modified Mercalli scale is based on measures of: Choose all that apply.

Given the ages of the different rock units that you see here, what is the age of the shale atop the volcanic ash?

Complete the image by labeling the features of an earthquake fault zone.