earthquake (teach)

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Post on 17-Jan-2015

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Short description of earthquakes, some reasons they occur and a look at the damage they can cause.

TRANSCRIPT

Page 1: Earthquake (Teach)
Page 2: Earthquake (Teach)

Remember the earth’s crust has huge cracks or faults in it.

As a result, the crust is broken up into huge pieces of rock called plates.

Page 3: Earthquake (Teach)

Although very slowly, these plates do move around as they float on the top of the liquid rock in the mantle called magma.

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Sometimes when these plates move in opposite directions they rub against one another .

The rough edges where the plates come together get caught and prevent the huge slabs of rock from going anywhere.

But when enough pressure builds up, the plates break loose with a jolt— an earthquake.

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It would be like a force pulling one half of a cracked pencil one way and another force pulling the other half of the pencil the opposite way.

Once enough pressure builds up, what would happen?

Yes,the pencil would break.

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http://earthquake.usgs.gov/learn/animations/animation.php?flash_title=Elastic+Rebound+Flash+Animation&flash_width=300&flash_height=350&flash_file=elasticrebound

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But what happens to people and things on the Earth’s surface when an earthquake occurs?

The huge jolt causes everything to move and shake violently.

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Ground shaking as the result of an earthquakes can cause buildings, walls and bridges to collapse.

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Cracks in the earth can open up as the result of an earthquake.

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Rock slides and/or landslides on mountains and hillsides. During an earthquake, large rocks and portions of earth high up in the hills can become dislodged and rapidly roll or slide down into the valleys.

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Tsunamis can occur. A tsunami is a large sea wave or series of waves that is caused by earthquakes and can destroy towns along the seashore.

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In Texas, kids in school practice what to do if a tornado were to strike.

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In other parts of the world, kids have earthquake drills.