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Unformatted text preview: Chapter 27 The Earth’s Interior Quiz: Did you read Chapter 27 for today? ) es a) Yes b) No Earth How do we know anything about the Earth’s Interior? s Direct Observations s Inferences from Meteorites s Evidences from Earth’s Mass & Density s Evidences from Seismology s Evidences from Earth’s Magnetic Field Direct Observations s Natural canyons: The grand canyon goes one mile deep - still quite shallow. rill: Deepest hole is 12.3 s Drill: Deepest hole is 12.3 km (7.6 mi). About 1/6 the way through the crust. s Surface sampling: Better than you’d think. s Rocks from volcanic eruptions: very good. The “Hole to Hell…” s Urban legend… • “Geologists working somewhere in remote Siberia had drilled a hole some 14.4 kilometers deep (about 9 miles) when the drill bit suddenly began to rotate ildly. A Mr. Azzacov (identified as the project's wildly. A Mr. Azzacov (identified as the project's manager) was quoted as saying they decided that the center of the earth was hollow. Supposedly, the geologists measured temperatures of over 2,000 degrees in the deep hole. They lowered super sensitive microphones to the bottom of the well, and to their astonishment they heard the sounds of thousands, perhaps millions, of suffering souls screaming.” Meteorites s Earth was made of material orbiting the sun. It still impacts the earth as Stony chondrite m e t e o r i t e s ....
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- Winter '08
- Crust, Mantle, Asthenosphere