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.

[Q]: Question: Mixtures of materials called alloys contain at least one of what type of material? Answer: metal
[A]: Alloys are mixtures of materials, at least one of which is a metal.

[Q]: Question: What element chemically weathers rock by combining with a metal? Answer: oxygen
[A]: Oxygen chemically weathers rock by combining with a metal.

[Q]: Question: Glaciers are incredibly powerful agents of what? Answer: erosion
[A]:
Glaciers are incredibly powerful agents of erosion.