Most of the pulling force driving plate motion is produced ________.

Aside from Earth, the terrestrial planets are ________.

The metal alloy that makes up the core of Earth is ________, as compared to the rocky mantle.

A volcano emits ash, which falls from the sky, settles in layers, and is eventually cemented. The resulting rock is termed ________.

Hot spots can occur ________.

In the figure below, which direction is the longshore drift?

Over 2,000 years ago, an ancient Greek astronomer concluded (correctly) that the ________.

The primary cause of recent global warming is believed to be ________.

The majority of liquid freshwater within Earth exists in ________.

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