The layer of the earth's atmosphere from the surface to approximately 2000 feet MSL where friction influences are large is called the ionosphere which is the part of the thermosphere.
<h3>What is the atmosphere?</h3>
The atmosphere is a combination of gases that are life supportive in nature and have a sufficient proportion of each gas. The gases play different roles which make life possible on earth.
The ionosphere, a component of the thermosphere, is the layer of the earth's atmosphere between the surface and about 2000 feet MSL where friction influences are significant.
Base on the question, I would say that the answer would that during a rainstorm, when soil becomes saturated, the amount of infiltration decreases and run off increases. So the correct answer would be #2. decrease and run off increase. I hope you are satisfied with my answer