2.
30 ft below surface used to be under water
3.
study of fossils of animals and plants
4.
material deposited at bottom of a body of water
5.
layers of mud + sand/over time become rock
6.
layer in earth with lots of fossils
7.
layer of rock often formed on top of another
8.
method for determining age of object
9.
visible features of earth's surface
10.
carved by the Colorado river
