Question

1. which of the following is an example of indirect evidence about earths layers?

a. rock samples obtained by drilling
b. mantle rocks produced by volcanoes
c. changes observed in seismic wave data
d. data gathered from high-pressure lab experiments
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Explanation:

Direct evidence involves physical samples of Earth's layers, while indirect evidence uses observations to infer properties of layers not directly accessible. Options A, B, and D involve physical samples or lab work on physical materials, making them direct. Seismic wave changes are observed remotely and used to deduce Earth's internal structure, so they are indirect evidence.

Answer:

C. changes observed in seismic wave data