McGlinnen Elementary 2nd/3rd Grade Students
Surface Changes
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Volcanoes V
S. Earthquakes
There are more than 500 active volcanoes in the world.
An Erupting volcano can trigger 5 different disasters.
More than 80% of the earth's surface is volcanic in origin.
A Volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth.
The danger area around a volcano covers about a 20-mile radius.
The largest recorded earthquake in the United States was a
magnitude 9.2 that struck prince william sound,Alaska on March 28,1964.
The largest recorded earthquake in the world was a magnitude 9.5 in chile on may 22,1960.
Natural events such as volcanic eruptions and meteor impacts can cause earthquakes.
The National Earthquake Information Center (NEIC) records an average of 20,000 earthquakes every year around the world.
Each year southern California has about 10,000 earthquakes.