TASK DEFINITION: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
PROBLEM: Question: What is the smallest class of elements? Answer: metalloids

SOLUTION: Metalloids are the smallest class of elements, containing just six elements. They fall between metals and nonmetals in the periodic table.

PROBLEM: Question: What is the least dangerous radioactive decay? Answer: alpha decay

SOLUTION: All radioactive decay is dangerous to living things, but alpha decay is the least dangerous.

PROBLEM: Question: What is hole that is dug or drilled through the ground down to an aquifer? Answer: well

SOLUTION:
Many people get their freshwater from an aquifer. They obtain the water through a well. A well is a hole that is dug or drilled through the ground down to an aquifer.