Given a scientific question, generate a correct answer to it.

Input: Consider Input: Coal, oil and natural gas are types of what formed from the remains of once living organisms?

Output: fossil fuels

Input: Consider Input: What is the term for learning by watching and copying the behavior of someone else?

Output: observational learning

Input: Consider Input: What is the smallest volcanic landform that is formed from accumulation of many small fragments of ejected material?
Output: cinder cones