Which ore minerals are commonly found in ancient sedimentary deposits that are 2 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, especially those that formed more than 2 billion years ago, during the Archean Eon. These iron oxides are often associated with banded iron formations, which are important deposits of iron ore. The other choices (copper sulfides, aluminum oxides, and copper oxides) are less common in sedimentary deposits and might occur in different types of rocks or geological settings.

Which Ore Minerals Are Commonly Found in Ancient Sedimentary Deposits