What happens in a landslide?

(a).the upper region of a hill becomes built up by rocks.

(b). soil washes away into a stream.

(c). water moves into an area where it does not belong.

(d). earth materials that are no longer held by friction move down a slope.

(A) The upper region of a hill becomes built up by rocks.

Since a landslide is happens when something becomes loose from a mountain or cliff, it is held by friction. Rocks, as well as large pieces of dirt and other objects help on to steep mountains by friction. 

Hope this helps you, have a BLESSED and wonderful day, as well as a safe one!

-Cutiepatutie ☺❀❤

the answer is b & c i believe : )

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.