Relative dating gives the ages of rocks relative to the ages of other rocks (e.g

Question

Relative dating gives the ages of rocks relative to the ages of other rocks (e.g., This rock is older than that rock or fossil). In undeformed sedimentary rocks, the oldest rock layer is found on the bottom and the youngest rock layer is found on the top. The figure to the right is a cross section through sedimentary rock layers. Which layer is the oldest? A B C D E How old (relative to the other layers) is the dinosaur bone? To the right is a cross section through sedimentary and volcanic rock layers. Sedimentary rock layer B contains a dinosaur bone. Which two of the absolute age dating methods would you use to determine the age of volcanic rock layers A and C? How could you determine the age of the dinosaur bone? If volcanic rock A is determined to be 90 Ma, and volcanic rock C is determined to be 80 Ma, what is the age of the dinosaur bone? Two students are debating the age of the dinosaur bone. Student 1: The bone is between 80 and 90 million years old. You can't be more specific because you can't determine how fast the layers were deposited. Student 2: I think the dinosaur lived 85 million years ago because the bone is exactly in the middle of the two volcanic layers. With which student do you agree? Why?

Explanation / Answer

Part 2
Answers
1)   The figure to the right cross section through sedimentary rock layers. Which layer is the oldest?
Answer: A
The layer A is the oldest layer than all, this is because of order of superposition of layers.
Order of superposition can describes the relative age dating of rocks.
2)   Answer: older than C D E and younger than A this is because of inclusions( bone) are always older than inclusion having layer.

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