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Harry Hess named the early supercontinent Pangaea.

After the 1964 Alaska earthquake, the most powerful recorded in North American history, most fatalities were caused by:

Processes of seafloor spreading can be described by what type of plate movement?

The farther a seismograph is from an earthquake focus, the shorter the P-S interval will be.

Ground shaking is the most common cause of fatalities and injuries after an earthquake.

The largest layer of Earth, in terms of volume is the:

An earthquake’s __________ is the point at which energy is first released.

Which earthquake measurement captures the amount of energy released? 

An earthquake’s epicenter is the point on the surface above the focus.

At _____________ boundaries, an earthquake focus can be shallow, intermediate, and deep.