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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They did calculations on the speed of sound in various material phases of the most probable matter at given locations, and study the waves from earthquakes and how they propagate through the different media, and noticed waves bounce off of a phase contrast boundary layer.
They did calculations on the speed of sound in various material phases of the most probable matter at given locations, and study the waves from earthquakes and how they propagate through the different media, and noticed waves bounce off of a phase contrast boundary layer.
They did calculations on the speed of sound in various material phases of the most probable matter at given locations, and study the waves from earthquakes and how they propagate through the different media, and noticed waves bounce off of a phase contrast boundary layer.
We know that because we send sound waves down into the ground.
Sound waves move faster when they pass through solid material.
So measuring how those waves change as they move through the earth tells us what kind of material they have travelled through.
We know that because we send sound waves down into the ground.
Sound waves move faster when they pass through solid material.
So measuring how those waves change as they move through the earth tells us what kind of material they have travelled through.
We know that because we send sound waves down into the ground.
Sound waves move faster when they pass through solid material.
So measuring how those waves change as they move through the earth tells us what kind of material they have travelled through.
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