An Important Way That Scientists Have Been Able to Study

Multiple Choice

An important way that scientists have been able to study the interior of the Earth is by:

A) studying the exterior, which is made of exactly the same material
B) digging deep trenches at the bottom of the ocean, which is a lot closer to the planet's center
C) using spacecraft that can detect strong radio waves coming from the center
D) measuring how seismic waves are transmitted through the Earth
E) there is no way we can study's the Earth's deep interior at the present time