The energy from earthquakes travels in waves. The study of seismic waves is known as seismology. One ingenious way scientists learn about Earth's interior is by looking at earthquake waves. Seismic waves travel outward in all directions from where the ground breaks and are picked up by seismographs around the world.
Scientist have learned by studying seismic waves that the earth has liquid in its outer core. They also can predict if a earthquake might happen in a spot in the next hundred years or so.
