Answer:
Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. The seismic waves are bent, sped up, or slowed down, or even reflected when they pass through the earth's layers.
Seismic waves are recorded by a machine called a seismograph, which tells us about the strength and speed of the seismic waves. ... Seismic waves travel at different speeds when they pass through different types of material, so by studying seismograms, scientists can learn a lot about Earth's internal structure.
Explanation:
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It’s false because the stars are alll different distances from earth. The stars in a constellation appear to be in the same plane because we are reviewing them from very very far away
Answer:
I'm pretty sure it's D but it might not be
It has layers because sediments continue to build up with the lighter stuff on the surface which pushes previous sediments down into layers.