1.which geologic principle is the reason rock layers typically form parallel to each other? (2 points)

cross-cutting relationships

original horizontality

superposition

unconformities

2.examine the following diagram. place the labeled layers in order from youngest to oldest. (2 points)

3.diagram showing a section of rock strata. the bottommost layer is labeled 'a'; the layer directly on top of layer a is labeled 'b'; the layer directly on top of layer b is labeled 'd'; a narrow section of rock, labeled 'c,' extends from a through b and d and culminates in a volcano.

a, b, c, d

c, d, b, a

d, a, b, c

c, b, a, d

which of the following is a technique used in relative dating? (2 points)

beta decay

index fossil correlation

isotope ratios

radiocarbon dating

4.after three half-lives, a sample contains 10 grams of parent isotopes. how many grams of the parent isotope were present to start? (2 points)

320

160

80

40

5.insects often get stuck in the sap of ancient trees. the sap along with the insect inside harden forming a fossil. what kind of fossil is this? (2 points)

an image showing a fossilized insect preserved in hardened amber.

public domain

cast

crystallization

mold

trace

6.which of the labeled fossils comes from the oldest organism? (2 points)

a

b

c

d
10.
7.a sample of rock is found to contain 200 grams of a parent isotope. how many grams of the parent isotope will remain after one half-life? (2 points)

100

75

50

25

8.explain how a paleontologist might use absolute dating techniques to determine the age of a fossil. (5 points)

9.you are digging a hole in your backyard when you see a piece of fossilized bone in the dirt. how could you prove the age of the fossil? design a procedure for determining the relative and absolute age of the bone. (5 points)