Earth has multiple layers: the crust, the mantle, the liquid outer core and the solid inner core.
(Image credit: NASA)
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Seismic Waves Shed Light on Earth's Weak MantleResearch may also offer insights into geology of other planets.
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Ocean Expedition Gets Rare Glimpse of Earth's InnardsThe studied rock is abundant but mostly out of reach.
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New High-Res Maps Peer Beneath Earth's SurfaceGravity satellite shows depth of boundary between crust and mantle.
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Plate Tectonics Becoming Clearer With ComputersModels getting better and seeing how plates collide and rift.
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Ancient Rocks Suggest Early Earth Was Motley MixAncient volcanic rocks withstood melt, mixing.
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Granite Photos: Bedrock of the EarthSturdy granite makes up mountain peaks and famous natural structures.
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GPS Uncovers Possible Southwest Quake RiskRio Grande Rift not dead, actively stretching.
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How Diamond-Rich Magmas Rise from Earth's DepthsKimberlite magmas rise much more rapidly than expected.
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Earth's Core Slowly Gives Up Its SecretsAn iron-diamond sandwich helped shed light on inner Earth.
