Question

what is an angle grinder used to grind?
soft, porous materials
hard, heavy materials
nonmetals only
imperfections in wood

Explanation:

An angle - grinder is a powerful tool typically used for grinding hard, heavy materials like metals, concrete, and stone. It is not meant for soft, porous materials which can be damaged easily, nor is it only for non - metals. While it can be used on wood in some cases, it is not mainly for removing imperfections in wood.

Answer:

B. hard, heavy materials