Question

part a
by looking at the different layers of the earth, we are able to gather information about the age and environment of that area. we can also compare its age to other layers. what is the term used to describe the age of fossil layers based on its location?
a evolution
b photosynthesis
c radioactive dating
d law of superposition
part b
based on your answer to part a, which of these best describes layers 1 - 5 versus layers 7 - 12?
a layers 1 - 5 are older and aquatic and layers 7 - 12 are younger and terrestrial
b layers 1 - 5 are older and terrestrial and layers 7 - 12 are younger and aquatic
c layers 1 - 5 are younger and aquatic and layers 7 - 12 are older and terrestrial
d layers 1 - 5 are younger and terrestrial and layers 7 - 12 are older and aquatic

Explanation:

For Part A, the law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top, which is used to describe the age of fossil - layers based on their location. For Part B, according to the law of superposition, layers 1 - 5 are younger (being higher up) and layers 7 - 12 are older (being lower down). Without additional information about aquatic or terrestrial nature, we assume the order of age based on superposition.

Answer:

Part A: D. law of superposition
Part B: C. layers 1 - 5 are younger and layers 7 - 12 are older