The hole in the ozone layer has been brought about by anthropogenic emissions of ________.

A majority of the melts in the Earth form through the partial melting of ultramafic mantle rock. These newly formed magmas are ________.

In the figure below, which way is the wave moving?

During most of the Mesozoic Era, Earth was ________.

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

Diagenesis refers to ________.

Currently, the most accurate ages of Earth come from dating ________.

Evidence that glaciers once covered an area might include ________.

You are a coastal geologist trying to help a coastal community restore its sediment-starved beach. You decide that beach nourishment is the best option, so you order that dredge sediment from the nearest river be placed on the beach. The sediment is 70% silt and 30% sand. What will be the effect of using this sediment?

The greenhouse effect is caused by ________.