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he Earth: A Dynamic Planet
1-4 Label the four layers of the Earth.
|14. __E__ subduction zone||A Pieces of the crust that "float" on the mantle.|
|15. __C__ convection currents||B The only ocean on Earth 250 million years ago.|
|16. __D__ Pangea||C Movements in a fluid caused by hotter material rising, then cooling and sinking in a circular motion.|
|17. __A__ Plates||D Supercontinent 250 million years ago|
|18. __B__Panthalassa||E Area where two plates are colliding. One plate is pushed down under the other plate.|
|19. __C__Magma||A The northern half of Pangea after it split apart.|
|20. __E__Continental Drift Theory||B The deepest places on the surface of the Earth. They are located at subduction zones.|
|21. __D__Mid-ocean ridge||C Molten rock below the surface of the Earth|
|22. __A__Laurasia||D Place where two plates are separating. These plates are moving in opposite directions making the oceans larger.|
|23. __B__Trenches||E The idea that the Earth's plates are "floating" on the mantle and have been for millions of years.