Ineed to get all grades up before the semester ! what happens in a landslide? a.) soil washes away in a stream b.) the upper region of a hill becomes built up by rocks c.) water moves into an area where it does not belong d.) earth matrials that are no longer held by friction move down a slope

Option D is correct.

Explanation:

Landslide is a kind of a mass waste of the earth and the main cause is the excess of water which reduces the friction of the earth material with the surface and it results in the Landslide.

Another reason for the landslide is an earthquake which generates movement with the ground layers and it results in Landslide.

To rescue from the landslide we should make the surface more and more water protective so that water could not contact the inner layer of the earth surface.

b) to encourage free trade