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24 Cards in this Set
- Front
- Back
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Natural Hazards occur from: |
1) external forces w/in earth 2) external forces on surface 3) gravitational forces |
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Hazard= |
process poses potential threat to humans or environment |
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Risk= |
prob of event occurring multiplied by impact to humans/ environment R=PxL (probability x loss) |
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Disaster= |
BRIEF event causing property damage/ death |
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Catastrophe= |
a massive disaster likely for catastrophe: tsunamis. earthquakes, volcano, hurricane flood unlikely: landslide, avalanche, wild fire, tornado |
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Magnitude Frequency concept |
intense events don't happen as often |
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Geological Cycle= |
encompasses tectonic cycle, rock cycle, hydrologic cycle |
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Tectonic Cycle= |
creation, movement and destruction of earth's plates tectonic plates= large blocks of earth's crust forming outer shell |
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where is new land created? where is it destroyed? |
mid ocean ridges (lava cools and forms land) subduction zones (sinks, form earthquake) |
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Earth's Structure (3 parts) |
Inner Core: hot and solid asthenosphere: upper mantle, hot magma w/ flow lithosphere: thin, brittle crust (cant hold back magma) |
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2 Types of Earth's Crust: |
oceanic: dense, thin continental: buyont, thick |
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Types of Boundaries |
-Divergent: move away from each other (seafloor spreading) -Convergent: towards each other (subduction-- volcanoes or collision-- mountains) -Transform : slide horizantally past (most beneath ocean) |
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transform fault= |
zonewhere movement occurs in transform boundary
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San Andreas Fault |
longest/ biggest fault goes through san fransisco |
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Hot Spots= |
areas found away from plate boundaries -spots where magma rises from mantle -associated w/ volcanos -string/ line of islands indicates hot spot -hot spots dont move but plates move over them so islands form in diff spots |
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Rock |
an agregate of one or more minerals |
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Hydrologic Cycle |
movement and exchange of water among the land, atmosphere and oceans by change of state -solar energy drives movement of water |
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Prediction |
specific time, date, location, magnitude |
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Forecast |
range of probability for the event (general) |
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Acceptable risk |
amount of risk an individual/ society is willing to take |
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economic loss is _____ is developing countries deaths____ in developed |
higher |
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Indirect Effects |
linger after event ex crop failure, starvation, emotional distress, loss of employment |
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Natural Service Function |
benefit of hazard |
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Himilayas |
mountain chain that is site of continent-continent collision |
