TASK DEFINITION: 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.
PROBLEM: Fact: Deep gorges are formed by flowing rivers through erosion over long periods of time. 
Question: What are formed by flowing rivers through erosion over long periods of time?

SOLUTION: deep gorges.

PROBLEM: Fact: Water must not be polluted to be safe. 
Question: What can happen to water to make it unsafe?

SOLUTION: Pollution.

PROBLEM: Fact: Adding something from the ocean to a liquid decreases the melting point of that liquid. 
Question: What can be added to a liquid to decrease the melting point of the liquid?

SOLUTION:
Something from an ocean.