
Concept explainers
The correct option for the statement "Earth's internal composition is revealed by".

Answer to Problem 7RAT
The correct option for the statement "Earth's internal composition is revealed by (d).
Explanation of Solution
Waves are generated inside the Earth due to various activities. The waves of the energy that can move within the Earth's layers, and which can cause an earthquake, magma movement, volcanic eruptions are known as the seismic waves. These waves travel at different materials at a different speed and also undergo refraction and reflection at the boundaries of two-layer having different materials.
Seismograms are a record of various seismic waves generated at a different time and at a different place. All the options are required to understand the composition of the Earth. So all the options are correct for this statement.
Conclusion:
Therefore, the correct option for the statement "Earth's internal composition is revealed by" is option (d).
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