structure of the earth
DESCRIPTION
Structure of the Earth. Crust = solid outermost layer Mantle = middle layer Core = inner layer outer core = liquid inner core = solid. Internal Heat Drives Geological Activity. Why do we have continental drift?. Convection: hot rock rises, cool rock falls. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/1.jpg)
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Structure of the Earth
Crust = solid outermost layer
Mantle = middle layer
Core = inner layer outer core = liquidinner core = solid
![Page 3: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/3.jpg)
Why do we have continental drift?Internal Heat Drives Geological Activity
Convection: hot rock rises, cool rock falls.
![Page 4: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/4.jpg)
Why do we have continental drift?
Earth has molten centerConvection current form in mantleThe crust moves with these currents
Internal Heat Drives Geological Activity
Convection: hot rock rises, cool rock falls& the solid surface of the Earth moves
![Page 5: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/5.jpg)
Surface of Earth Divided into Pieces called "Plates"
![Page 6: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/6.jpg)
Figure 1-21
Surface of Earth Divided into Pieces called "Plates"
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Most Volcanoes form at plate boundaries
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Most Earthquakes occur at plate boundaries
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Types of Plate Boundaries
Transform boundaries
Figure 1-30
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Transform boundary Example: San Andreas Fault in CA
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Transform boundary Example: San Andreas Fault in CA
![Page 12: Structure of the Earth](https://reader035.vdocuments.site/reader035/viewer/2022062803/5681478c550346895db4bbbe/html5/thumbnails/12.jpg)
Types of Plate BoundariesDivergent boundaries
Figure 1-25
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Types of Plate BoundariesDivergent boundaries
Example: Mid ocean ridge
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Types of Plate Boundaries
Continental collision
Figure 1-27
Convergent boundariescontinental collision
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Types of Plate Boundaries
SubductionConvergent boundaries
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Hawaii = Hot spot
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What kind of plate boundaries are there off Washington’s coast?
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Cascadia subduction zone in side view
http://en.wikipedia.org/wiki/Image:Subduction.jpg
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http://www.nps.gov/archive/olym/geology/accretion.htm
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