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41 Cards in this Set
- Front
- Back
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6 Topographic Regions
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Plains
High tablelands Hills and low tablelands Mountains Widely spaced mountains Depressions |
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Craton
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- a nucleus of ancient crystalline rock (>2 billion year) low elevation, relief thick crust
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Continental shield
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exposed craton
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terranes
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crustal pieces that become attacked to plates, sometimes called microplates
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strain
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rocks response to stress
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uniform confining stress
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equal pressure from all sides
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controls over fracture point
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composition and conditions
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stress can cause either..
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strain or fracture
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reverse fault,
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from compression
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horst graben
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horst is uplifted block and graben is downfaulted, gives distinctive landscape
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faults become:,
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folds
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folds become
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wrinkles
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orogenesis:
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mtn building, thickened crusts
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focus of earthquake
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underground
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elastic rebound theory
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why earthquakes happen
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6 Topographic Regions
|
Plains
High tablelands Hills and low tablelands Mountains Widely spaced mountains Depressions |
|
|
Craton
|
- a nucleus of ancient crystalline rock (>2 billion year) low elevation, relief thick crust
|
|
|
Continental shield
|
exposed craton
|
|
|
terranes
|
crustal pieces that become attacked to plates, sometimes called microplates
|
|
|
strain
|
rocks response to stress
|
|
|
uniform confining stress
|
equal pressure from all sides
|
|
|
controls over fracture point
|
composition and conditions
|
|
|
stress can cause either..
|
strain or fracture
|
|
|
reverse fault,
|
from compression
|
|
|
horst graben
|
horst is uplifted block and graben is downfaulted, gives distinctive landscape
|
|
|
faults become:,
|
folds
|
|
|
folds become
|
wrinkles
|
|
|
orogenesis:
|
mtn building, thickened crusts
|
|
|
focus of earthquake
|
underground
|
|
|
elastic rebound theory
|
why earthquakes happen
|
|
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how to locate the epicenter 4 steps
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time the arrivals, determine the difference, calculate distance, triangulate
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krakatau
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1883, global temp fell .5 C, 5 years for dust to fall out
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where are volcanoes 3
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subduction boundaries, mid ocean ridges, hot spots
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more silica in magma means
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high viscosity, slow flow
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tephra
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volcanic ash
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two types of eruptions
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1. effusive, low viscosity, gentle, little pyroclastics mauna loa
2. explosive, opposite rainier |
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if both types of volcanoes
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composite or stratovolcanoes
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two types of seismic waves
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P, compressional
S shear |
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hypsometry:
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distribution of earths surface by area and elevation in relation to sea level
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MELT
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magma that rises up from subducted oceanic plate taking down seawater and other material
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shield volcanoes
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result from effusive eruptions, gentle slopes
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