Earth Science Review

Front

Scientists estimate that the Earth is approximately ____ years old.

Back

4.6 billion

Front

The ______ of the Earth is mostly made up of iron and contains roughly one-third of the Earth's mass.

Back

core

Front

The tectonic plates move on the ___________ -- the soft, upper layer of the mantle.

Back

asthenosphere

Front

Which scientist described the theory of continental drift? Options: Alfred Wegener, Charles Darwin, James Hutton, Charles Lyell

Back

Alfred Wegener

Front

___________ is when hot rock from deep within the Earth rises, but cooler rock sinks.

Back

Convection

Front

_______ is the sudden return of elastically deformed rock to its undeformed shape.

Back

Elastic rebound

Front

Scientists use a(n) __________ to record vibrations in the ground and determines the location and strength of an earthquake.

Back

seismograph

Front

The _______ is the point along a fault at which the first motion of an earthquake occurs.

Back

focus

Front

True or False? The gap hypothesis states that a major earthquake is more likely to occur along the part of an active fault where many earthquakes have occurred recently.

Back

False

Front

A 2.0 earthquake on the Richter Magnitude Scale

Back

would only be detected by a seismograph.