Question

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

Explanation:

An angle - grinder is a powerful tool typically used for tasks like cutting, grinding, and polishing hard, heavy materials such as metals, concrete, and stone. It is not mainly for non - metals only, not for soft, porous materials, and not primarily for wood imperfections.

Answer:

hard, heavy materials