Vocabulary N° 12

1. Crust: Earth´s solid,rocky surface containing the continents and ocean floor.



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  By earthquakes and volcanoes eruptions people can feel the crust moving.

2. Original Horizontality: The idea that many kinds of rocks form in flat,horizontal layers.

 

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  The original horizontaly layers are the young, medium and the oldest one.

 3. Continental Drift: The idea that a supercontinent split apart into pieces, the continents, which drifted in time to their present locations.

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  The continental drift was called Pangea.

4. Sea-floor spreading: The idea that new crust is forming at ridges in the sea floor,spreading apart the crust on either side of the ridges.



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  There is many sea floor spreading in Hawaii.

5. Magma: Hot,molten rock below Earth´s surface.



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  There is many magma in Hawaii.

6. Plate Tectonics: The idea that Earth´s surface is broken into plates that move.



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  The plate tectonics move around the mantle.

7. Mantle: Earth´s layer beneath the crust.



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  Mantle is a part of a rocky body large by density.

8. Subduction: Where plates collide, the sliding of a denser ocean plate under

another plate.

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  In subduction the plate sinks down the mantle.