Which feature of the layers of earth contributes to the various geological events? a) the crust being made of a single layer all over b) the crust being of same thickness all over c) the lower mantle being made of solid rock d) the lower mantle being relatively hotter

The correct answer is - D) the lower mantle being relatively hotter.

The lower mantle plays a crucial role in the geologic activities that appear on the Earth. This is because the lower mantle has much higher temperatures than the surface, as well as having much bigger pressure, and both of these things contribute to the formation of the convection currents in the mantle.

The convection currents are the ones that bring in the high temperature and pressure towards the surface, so they make a lot of pressure on the crust, and eventually crack it. As they have cracked the crust into multiple peaces, all of those peaces are moving because of the convection currents, thus creating all of the geologic activity in meantime.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.