During which eon did oxygen begin to build up the most in Earth’s atmosphere? Hadean

Phanerozoic

Archean

Proterozoic

Compare the composition of the moon's surface with the composition of the earth's surface.

Aprocedure done under controlled conditions to test a hypothesis is an inquiry.

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land