How does scientists know earth has a solid core surrounded by mantle when we have never dug so deep? How do that happens when IMO 12 km is the deepest we have dug?
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Scientists have used seismic waves to determine the composition of the Earth’s interior. Seismic waves are like sound waves, but they travel through the Earth instead of through the air. When an earthquake occurs, seismic waves travel through the Earth and bounce off boundaries between different layers. By measuring the time it takes for the waves to travel to different points on the Earth’s surface, scientists can determine the size and composition of the Earth’s core, mantle, and crust. Because seismic waves travel faster through solid material than through liquid material, scientists can determine that the Earth’s core is solid and the mantle is liquid.
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