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

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
Trust me I got 100% on my test.
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It would be nice to know what layers b and d are.

A lil late jascha

To determine the age relationship between layers B and D, we need to understand the principles of relative dating. Relative dating involves placing rocks and fossils in a sequence of formation based on their order of deposition. Here's how you can compare the age of layers B and D:

1. Law of Superposition: Start by applying the Law of Superposition, which states that in an undisturbed sequence of sedimentary rock layers, the youngest rocks are located on top, and the oldest rocks are at the bottom. Using this principle, we can assume that layer B is older than layer D.

2. Unconformity and Erosion: If the rock layers between B and D have eroded away, it suggests that an unconformity has occurred. An unconformity represents a time gap in the geologic record due to erosion or non-deposition of sedimentary layers. In this context, the boundary between layers B and D is likely to be an unconformity surface or contact.

3. Geologic Time Scale: To further determine the relative age difference between layers B and D, consult the geologic time scale. The geologic time scale provides a framework for understanding the history and age of the Earth and the rocks and fossils found within it. By comparing the fossil assemblages or other chronostratigraphic markers found in the remaining layers, you can estimate the relative age difference between layers B and D.

In summary, layer B is older than layer D based on the Law of Superposition, and the boundary between B and D, where the eroded layers once existed, can be termed an unconformity. To determine the specific age difference, you would need to analyze the remaining layers' fossils or chronostratigraphic markers within the geologic time scale.