Answer:
4. all of the above
Explanation:
all of these are correct so...all of the above
Letter B is correct answer that what I am thinking
Answer: when one is lost, one is formed
Answer: the relative differences in arrival times of the S and P seismic waves at several recording stations tell scientists about the different speeds those waves were traveling at, which in turn gives information about the density of the material the layer is made of, and how thick the layer is in several directions.
Explanation:Earth's layers
