Gravity pulls more strongly on denser materials so denser materials are at the center of things. Earth's core, at its center, is denser than its crust. The lowest layer of the atmosphere is denser than the upper layer. Earth's liquid metal outer core has convection, which generates the magnetic field.
<span>In Economic conditions, uneven development is the increasing space between regions in the core, and in the periphery from globalizing the economy. </span>
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Study a place without actually having to be there.
<span>people in areas with limited freshwater
Desalination is the process of removing salt from (usually) ocean water making it fresh water.
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