Question

During an earthquake, scientists at a seismic station observed that some waves were detected earlier than others. What is the likely cause of this observation?

A. Uniform pressure inside Earth made the waves move at the same speed.
B. Uniform temperature inside Earth made the waves move at different speeds.
C. Variation in density inside Earth made the waves move at different speeds.
D. Variation in temperature inside Earth made the waves move at the same speed.

Answer 1

Answer:

A. uniform pressure inside earth made the waves move at the same speed