Question
Fossils in Rock Strata
Scientists are investigating rock formations at two different locations. The scientists find different fossils in the layers at each location. The scientists have labeled each rock layer with a letter. The rock layers are shown.
On the left, Location A shows 5 rock layers labeled 'A' through 'E'. Layer A shows an ammonite fossil and a fish fossil. Layer C shows a dinosaur fossil and a plant fossil. On the right, Location B shows 3 rock layers labeled 'F' through 'H'. Layer G shows a dinosaur fossil and a plant fossil.
Two-Part Question
Multiple Choice Question
The following question has two parts. First, answer Part A. Then, answer Part B.
Part A:
Which two rock layers are the same age?
A.
Layers A and F
B.
Layers E and H
C.
Layers C and G
D.
Layers D and F
Multiple Choice Question
Part B:
Which evidence supports the choice in Part A?
A.
Both of these rock layers lack fossils.
B.
Both of these rock layers are top layers.
C.
Both of these rock layers are bottom layers.
D.
Both of these rock layers have similar index fossils.
Scientists are investigating rock formations at two different locations. The scientists find different fossils in the layers at each location. The scientists have labeled each rock layer with a letter. The rock layers are shown.
On the left, Location A shows 5 rock layers labeled 'A' through 'E'. Layer A shows an ammonite fossil and a fish fossil. Layer C shows a dinosaur fossil and a plant fossil. On the right, Location B shows 3 rock layers labeled 'F' through 'H'. Layer G shows a dinosaur fossil and a plant fossil.
Two-Part Question
Multiple Choice Question
The following question has two parts. First, answer Part A. Then, answer Part B.
Part A:
Which two rock layers are the same age?
A.
Layers A and F
B.
Layers E and H
C.
Layers C and G
D.
Layers D and F
Multiple Choice Question
Part B:
Which evidence supports the choice in Part A?
A.
Both of these rock layers lack fossils.
B.
Both of these rock layers are top layers.
C.
Both of these rock layers are bottom layers.
D.
Both of these rock layers have similar index fossils.
Answers
GPT-4o mini
**Part A:**
The correct answer is **C. Layers C and G**.
**Part B:**
The correct answer is **D. Both of these rock layers have similar index fossils.**
**Explanation:**
Layers C and G contain similar fossils, specifically both have dinosaur fossils and plant fossils, suggesting that they are from the same geological time period. Index fossils are used to help determine the relative ages of rock layers and indicate that the layers are likely contemporaneous.
The correct answer is **C. Layers C and G**.
**Part B:**
The correct answer is **D. Both of these rock layers have similar index fossils.**
**Explanation:**
Layers C and G contain similar fossils, specifically both have dinosaur fossils and plant fossils, suggesting that they are from the same geological time period. Index fossils are used to help determine the relative ages of rock layers and indicate that the layers are likely contemporaneous.