Think about the example of the food chain, when the snake population grew out of control. imagine the opposite. imagine that there was a bounty on snakes and people were allowed to kill them and turn them into their local sheriff for a reward. what would happen in the food chain then?

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.