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Evidence for the structure of the
earth
- Direct
- Geothermal gradient
- The average geothermal
gradient of the earth is about 25
degrees
- The temperature gradient is lower in the mantle
- Radioactive heat production is concentrate within the crust
- The mechanism of thermal transport changes
form conduction within the rigid lithosphere plates,
to convection in the asthenosphere and the upper
mantle, and this transports the heat differently
- Radioactive heat production is concentrate within the crust
- The average geothermal
gradient of the earth is about 25
degrees
- Volcanoes bring magma form depth
- Mines and Boreholes
- Ophiolite suites-ocean crust on land
- During the collision of plates, sections of
oceanic crust may be broken off a descending
oceanic plate and thrust onto the edge of the
continental plat, instead of being carried down
into the mantle
- They may be exposed to erosion
- They may be exposed to erosion
- During the collision of plates, sections of
oceanic crust may be broken off a descending
oceanic plate and thrust onto the edge of the
continental plat, instead of being carried down
into the mantle
- Geothermal gradient
- Indirect
- Seismic waves
- P and S waves are seismic waves that
travel through the layers of the earth
- body waves
- faster if the rock becomes more rigid
and more incompressible
- slower if the rock becomes more dense
- faster if the rock becomes more rigid
and more incompressible
- body waves
- P and S waves are seismic waves that
travel through the layers of the earth
- The shadow zone
- Where P and S waves cannot pass
- Seismic waves are refracted at the Gutenberg discontinuity
- Seismic waves are refracted at the Gutenberg discontinuity
- Where P and S waves cannot pass
- Density
- Meteorites
- Seismic waves
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