Melissa is much older than Scott.
Rachel is younger than Wes, but the same age as Donna.
Sara is several years younger than Anthony.
Tommy is 10 years old.
The remains of an organism.
Principle of Horizontality
Principle of Superposition
Principle of Extrusion
Principle of Inclusion
B, I, F, H, R, M
R, M, H, F, B, I
I, B, F, M, H, R
H, R, M, F, B, I
Eras and periods
Large crater found in Mexico.
Samples of dinosaur lungs in fossils.
Existence of insects during the Triassic period.
Fossils found in the top layer of the Grand Canyon.
Carbon dioxide in ice core samples