Question

An ore is a rock that contains which of the following? A. a mineral or metal with economic usefulness B. a gemstone only C.a mineral or metal with no practical use D. particles of rock that erode into sediment

Answer 1

The correct answer is option A. "a mineral or metal with economic usefulness".

Step-by-step explanation:

An ore is defined as a rock or sediment found in nature which contains a mineral or metal with economic usefulness. The minerals or metals in the ore must be extracted before they could be used, and typically, they are refined via smelting. The ore grade is defined according to the concentration of the mineral or metal beneath the rock or sediment.

Answer 2

I think the correct answer among the choices presented above is option A. An ore is rock that contains a mineral or metal with economic usefulness. Examples are copper ore, gold ore and iron ore. These ores are being extracted from the Earth by mining.