TASK DEFINITION: In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
PROBLEM: Question: Katie has a garden and she installs a small waterfall. Since Katie sets the water to flow very slow and gentle over the sloping fall, the erosion at the bottom of the waterfall will be 
 Answer: less

SOLUTION: A gentle slope favours slower flow of surface water, reduces erosion, and increases availability of water to plants.

PROBLEM: Question: Dwayne Johnson is weaker than Kevin Hart because he exercises less and therefore his muscles have grown 
 Answer: smaller.

SOLUTION: Exercising muscles increases their size, and bigger muscles have greater strength.

PROBLEM: Question: If Milo lives in a country that starts producing pollution which causes the ozone layer to deplete, what happens to the amount of UV rays that can reach the ground? 
 Answer: increase

SOLUTION:
With less ozone in the stratosphere, more UV rays reach the ground.