Term
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Definition
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Term
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Definition
-sudden displacement of water
-under water landslides
-meteorite or astroid
-volcanic eruption and collapse
-displacement or offset of ocean floor by faulting earthquakes submarine |
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Term
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Definition
| the height of wave above normal high tide when it hits land |
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Term
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Definition
| squareroot(gravity x water depth) |
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Term
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Definition
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Term
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Definition
fire fragments- three types..
ash-smallest
cinders-pumice
lava bombs
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Term
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Definition
kill the most people, rapid flowing clouds of ash, pumice, and steam
-moves up to 200km/h
800 degrees C |
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Term
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Definition
even faster hotter, mostly gas (shock waves)
ash falls every where, enough weight mixed with water can collapse buildings
-bad for engines |
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Term
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Definition
| ash mixing with glaicer, river, rain water, very hot slurry like mud |
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Term
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Definition
| mountain formed by products of volcanic eruptions |
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Term
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Definition
molten rock, liquid, melted
h2o vapor, co2, sulfuous gas |
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Term
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Definition
| magma that flows on the surface |
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Term
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Definition
1. increase temp (least common)
2. drop pressure- decompression melting
3. add water
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Term
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Definition
igneous rocks
low silica- 50% low viscosity (fe,mg)
int. silica- 60% (andesite)
high silica- 70% lightcolored rhyolite sticky
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Term
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Definition
effusive- low viscosity
bubbles form deep causing magma to rise and flow out |
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Term
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Definition
bubbles deep down cannot escape causing explosive eruption of fragments
int. to high viscosity
andesite and rhyolite |
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Term
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Definition
small non explosive
basalt-->"splatter" blobs of magma
cone shaped pile of hardened basalt cylinders
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Term
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Definition
non explosive
runny basalt- big flat mountain |
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Term
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Definition
explosive
andesite/dacite |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| the gasses a volcano emits |
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Term
| when does a landslide occur |
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Definition
| when the driving force is greater than the resisting force |
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Term
| how can you increase the driving force |
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Definition
increase the weight load
-build a house
-weight of water
-weight of irrigation
by removing support at base of slope
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Term
| how can you decrease resisting force |
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Definition
lower friction on the sliding surface.
losing cohesion with
-water
-weathering
-roots of trees
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Term
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Definition
steepest angle at which loose material is stable
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Term
| how do you know that you are in landslide country? |
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Definition
look for signs of previous landslides
tilted trees- gunn butt trees
hummocky terrain- bumpy rough surface
scars or scarps on the slopes |
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