1) Convection currents<span> in the magma drive plate tectonics. Heat generated from the radioactive decay of elements deep in the interior of the </span>Earth<span> creates magma (molten rock) in the aesthenosphere. The aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the </span>Earth<span>that extends to 2900 km.
2) </span><span>The plates on the </span>Earth's<span> surface would be floating on top of the water. ...</span>Convection currents<span> in the liquid mantle </span>cause<span> the plates to </span>move<span>. At the top of the mantle, the rock encounters the thin </span>crust<span>, and, as it pushes it aside, lava flows out from the mantle to form new oceanic </span>crust<span>.</span>
Population? Because the main name is local population so it might be that
The most important source of freshwater in the western Sahel region is C. The Niger River.
Nile and the Tigris-Euphrates
