What is the term for the remains of things found in rocks?

Greg goes to a high school and observes the way students talk to each other. he makes notes on the words used, the atmosphere of the school and the way the students present themselves to each other. this is an example of a( research method.

The u.s. intervened in korea and vietnam to stop the spread of

This was an act of continental congress which initially organized the first united states territory and was to be the basis for governing how the united states would expand westward.