Tectonic plates are parts (pieces) of the outermost layer of Earth: the Crust. (the outermost part of the mantle is also often included in the plates). This means that the land in the middle of the plates is relatively stable while the borders of the plates can be in movement - after all this is where two pieces meet. Plate borders are where the vocanoes and Earthquakes often take place.
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Is this homework? do you need me to click the link or anything??
It might be let me think a square root is right
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Sand sheets and dunes cover approximately 25 percent of the Sahara's surface.