instruction:
Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.
question:
Fact: wind causes wearing away of rock. 
Question: Wind can cause?
answer:
the wearing away of rock.


question:
Fact: Damming a river can cause something with fresh water to form. 
Question: What is the thing that is created by damming a river made of?
answer:
Fresh water.


question:
Fact: things that have a glomerulus are the structural units of the kidneys. 
Question: things that have a what are the structural units of the kidneys?
answer:

glomerulus.