Interior of the Earth Interior of the Earth
- Slides: 28
Interior of the Earth
Interior of the Earth I. Morphology of Earth's Interior
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km)
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 1. continental rocks (ave: 35 km thick)
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 1. continental rocks (ave: 35 km thick) • granitic/andesitic in composition
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 1. continental rocks (ave: 35 km thick) • granitic/andesitic in composition • Rich in K, Si, Al
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 1. continental rocks (ave: 35 km thick) granitic/andesitic in composition • Rich in K, Si, Al • Less dense than oceanic
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 2. oceanic rocks (ave: 5 km thick)
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 2. oceanic rocks (ave: 5 km thick) • basaltic in composition
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 2. oceanic rocks (ave: 5 km thick) • basaltic in composition • rich in Mg, Ca, Fe
Interior of the Earth I. Morphology of Earth's Interior A. Crust (ave thickness: 20 km) 2. oceanic rocks (ave: 5 km thick) • basaltic in composition • rich in Mg, Ca, Fe • more dense than contin. Rx
I. Morphology of Earth's Interior B. Mantle (thickness: 2885 km)
I. Morphology of Earth's Interior B. Mantle (thickness: 2885 km) • Contains 80% of earth’s volume • Knowledge? ?
I. Morphology of Earth's Interior B. Mantle (thickness: 2885 km) • Contains 80% of earth’s volume • Knowledge? ? • Composition: Olivine (Rock: Peridotite)
I. Morphology of Earth's Interior B. Mantle (thickness: 2885 km) • Contains 80% of earth’s volume • Knowledge? ? • Composition: Olivine (Rock: Peridotite) • Behaves like Silly Puddy
I. Morphology of Earth's Interior B. Mantle (thickness: 2885 km) • Contains 80% of earth’s volume • Knowledge? ? • Composition: Olivine (Rock: Peridotite) • Behaves like Silly Puddy • “solid like the crust, but elastic at the same time”
C. Features found within crust and mantle
1. Lithosphere (Rigid) • includes the entire crust and part of the upper mantle • behaves as a brittle solid
2. Astenosphere – (weak) • • • not a total liquid; partially molten (1400 C) easily deformed analog to red-hot iron
3. Moho Discontinuity • • • *Discovered by Yugoslavian scientist (1909) Found evidence of layering of earth through seismic wave velocities Boundary separates crustal rocks from mantle rocks
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D. Outer Core (thickness = 2270 km)
D. Outer Core (thickness = 2270 km) • 2270 km radius • liquid
D. Outer Core (thickness = 2270 km) • 2270 km radius • liquid • composed of iron, and minor amounts of sulfer. Trace amounts of Si, O, Ni, K • The Evidence? ? ?
E. • • • Inner Core thickness = 1216 km solid Dominantly Fe in composition, Traces of Ni The Evidence? ?
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