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 causes blue litmus to turn red? Answer: acid

SOLUTION: Acids change the color of certain acid-base indicators. Two common indicators are litmus and phenolphthalein. Blue litmus turns red in the presence of an acid, while phenolphthalein turns colorless.

PROBLEM: Question: What makes up the dense outer layer of bones? Answer: compact bone

SOLUTION: Compact bone makes up the dense outer layer of bones.

PROBLEM: Question: What can lenses be used to make? Answer: visual representations

SOLUTION:
Lenses can be used to make visual representations, called images .