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The Forever Moving Land
Beginning of paper
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 trenches
through convection current. The .... Middle of paper
.... that still exists today. The immense heat from the magma (approximately
2700(C) causes convection in the mantle (Figure 1). Convection is caused by
non-uniform temperature in a fluid and density differences. This continuous
convection is the cause of plate movement. Each complete cycle, called a
convection cell, drives the plate in the direction of the cell. How does a
'solid' mantle move? The mantle may be solid but, as with most s ....
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Number of words: 2829
Number of pages: 11 (approx. 250 words per double-spaced page)
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