Discussion
Which of the following is an indirect source for obtaining information about the interior of the Earth ?
Answer: A
The indirect source is gravitation.
Information about the Earth's interior comes from direct sources, materials we can actually examine, and indirect sources, inferences from measurements. Variations in gravity at different places, together with magnetic surveys and seismic waves, are indirect sources.
Surface rocks, rocks obtained from mining and drilling, and material thrown out by volcanic eruptions can be examined directly, so they are direct sources.
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