Identify and briefly describe the 3 themes in earth’s history

The three great themes of earth's history are deep time, plate tectonics, and evolution of life.

Explanation:

Deep time: It is the geologic concept of time which was developed by Scottish geologist James Hutton during the 18th century. It is the time divided in the history of earth expressed in terms of million years. Million year is the convenient unit of deep time.Plate tectonics: The plate tectonics is the theory given by the scientists which assumes that there are seven large plates on the earth's surface and this theory describes ts motion along with the number of smaller plates of lithosphere.Evolution of life: It is the gradual process of change in characteristics of living organisms or life for the adaptation in the ever changing environment. It occurs by natural selection.

The exchange of foods between the new and old worlds