Question

valuable minerals
an ore is a rock that contains what?
particles of rock that erode into sediment
a gemstone only
a mineral or metal with economic usefulness
a mineral or metal with no practical use

Explanation:

An ore is defined as a naturally occurring rock that contains a sufficient concentration of a mineral or metal, which can be extracted and processed for economic gain. The other options are incorrect: eroded rock particles are sediment, ores are not limited to gemstones, and ores have practical economic use.

Answer:

○ a mineral or metal with economic usefulness