Definition: In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

Positive Example 1 -
Input: Question: Frilled sharks and angler fish live far beneath the surface of the ocean, which is why they are known as? Answer: deep sea fish
Output: deep sea animals live deep in the ocean.

Positive Example 2 -
Input: Question: An example of lots kinetic energy would be? Answer: An aircraft taking a trip
Output: as an object moves , the kinetic energy of that object will increase.

Negative Example 1 -
Input: Question: Brackish water is often found where? Answer: several large rivers meet.
Output: a canyon forming occurs over a period of millions of years

Negative Example 2 -
Input: Question: Evaporation is the reason that? Answer: a rain puddle is suddenly gone.
Output: acid rain has a negative impact on water quality

Now complete the following example -
Input: Question: A rock tumbler revolves to? Answer: smooth gemstones.
Output: 


Output: contact between rocks over long periods of time causes rocks to smooth