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41 Cards in this Set

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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
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
how to locate the epicenter 4 steps
time the arrivals, determine the difference, calculate distance, triangulate
krakatau
1883, global temp fell .5 C, 5 years for dust to fall out
where are volcanoes 3
subduction boundaries, mid ocean ridges, hot spots
more silica in magma means
high viscosity, slow flow
tephra
volcanic ash
two types of eruptions
1. effusive, low viscosity, gentle, little pyroclastics mauna loa
2. explosive, opposite rainier
if both types of volcanoes
composite or stratovolcanoes
two types of seismic waves
P, compressional
S shear
hypsometry:
distribution of earths surface by area and elevation in relation to sea level
MELT
magma that rises up from subducted oceanic plate taking down seawater and other material
shield volcanoes
result from effusive eruptions, gentle slopes