how do layers b and d compare in age? if rock layers between b and d have eroded away,what is the boundary between b and d called
What are layers b and d? We don't have your graphic.
they are layers pictured. B is one layer closer to the ground than D
but D is only a small patch beneath the ground
1.b
2.a
3.a
4.b
5.c
6.a
7.a
8.c
9.a
10.c
11.c
12.b
13.a
14.a
15.D is older than B because B pushes on D. The boundary is called an unconformity.
16. The half life is 28 years because it is the time it takes for one half of the original amount of strontium-90 to decay.
17.essay
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To determine the age relationship between rock layers B and D, we can use the principles of relative dating. Relative dating is based on the idea that in undisturbed rock layers, the lower layers are usually older than the ones above them.
To compare the ages of layers B and D, we need to look for any clues in the rock layers themselves or in the surrounding rock formations. This can include studying the types of fossils, sedimentary structures, or geologic events found in the layers.
However, the question states that rock layers between B and D have eroded away. In this case, we need to rely on another principle called the Law of Superposition. According to this principle, in an undisturbed sequence of rocks, the oldest rocks are at the bottom, and the youngest are at the top.
Since the rock layers between B and D have eroded away, we can assume that whatever remains of layer B is older than layer D. The boundary between them is known as an unconformity. An unconformity represents a time gap in the geologic record due to erosion or non-deposition of sediments.
Therefore, we can conclude that layer B is older than layer D, but the exact age difference cannot be determined without additional information or dating techniques like absolute (numerical) dating.