What are three good things plate tectonics provide for humans?

Energy is the ability to do work which measures what

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Which branches of natural science include the study of an organism that lived 10 million years ago