Which ore minerals are commonly found in ancient sedimentary deposits that are two billion years old?
A) copper sulfides
B) aluminum oxides
C) iron oxides
D) copper oxides

Question

Quizplus · Accepted Answer

Iron oxides, such as hematite and magnetite, are commonly found in ancient sedimentary deposits that are two billion years old. Copper sulfides and copper oxides are more commonly found in younger deposits associated with igneous activity, while aluminum oxides are more commonly found in tropical weathering environments.

Which Ore Minerals Are Commonly Found in Ancient Sedimentary Deposits