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The Forever Moving Land
Beginning of essay
The land below us is always in motion. Plate tectonics studies these
restless effects to give us a better understanding of the Earth and its past.
New molten rocks are poured out in the form of magma from the mid-ocean ridges.
The rock is recycled and re-entered back into the earth in deep ocean t ....
Middle of essay
....ed; "...like Silly Putty which seeps into
the rug when left unattended, mantle material flows when subjected to small
long-term stresses."1
Presently, there are more than fourteen plates in the Earth's crust
(Figure 22). Upwelling hot magma flows out from mid-ocean ridges and then cools
down when exposed to the cooled environment outside; the layer of cooled magma
forms the lithosphere. When magma flows out from the ridges, the crust is
fractured and a new ocean floor is built spreading per.... |
| Number of words: 2829 |
Approximate pages: 11 |
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