Help me please

Why is it important to study each branch of earth science?

This is collection of data made by comparing objects in standard units. in science, the units are metric.

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