Which phrase describes an example of mass movement? sediment settling on a mountain
soil mixed with water sliding off a cliff
wind blowing sand particles across a beach
rocks breaking into sediment as they fall to the ground

b

Explanation:

soil mixed with water sliding off a cliff

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.