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Broken into tectonic plates, Crust + upper mantle
Lithosphere
Who proposed continental drift
alfred wegner
where is EQ/seismic activity concentrated
plate boundaries
most divergent + transform boundaries are located at the
MOR
(C, D, T) san andreas fault
T
(C, D, T) btwn eurasian + indian plate
C
(C, D, T) Mid-Atlantic Ridge
D
(C, D, T). Japan
C
(C, D, T) Iceland
D
(C, D, T) Andes Mts
C
(C, D, T) fissure volcanism
D
most severe EQ activity (C, D, T)
C
_______ & ______ are the primary forces that move the plates
convection & Gravity
What layer occupies over 80% of the earths internal volume
mantle
reference line for longitude?
what direction does it measure?
Prime meridian
E-w
The hawaiian islands are ________ volcanoes, they formed over a ____ _____ deep in the mantle
shield
hot spot/mantle plume
Major tectonic process occuring at MOR/divergent boundaries
sea floor spreading
2 exs of Volcanic Island Arcs
japan & aleutian islands
The oldest oceanic crust is much ______ than any continental crust on earth
YOUNGER
(C, D, T) btwn Nazca plate & pacific plate
D
boundary at base of the crust
moho
plastic solid area in upper mantle, where tectonic plates move
asthenosphere
(C, D, T) volcanic island arcs
C
(C, D, T) himalayas
C
(C, D, T) andes mtns
C
(C, D, T). ring of fire
C
Composite volcanos. (C, D, T)
C
(C, D, T) Anatolian Fault
T
(C, D, T). Regional metamorphism, rocks are deformed
C
(C, D, T) Deep focus EQs dominate
C
List the 4 seismic waves on a seismogram in order
primary waves
secondary waves
surface waves
aftershocks
What seismic wave will not travel through liquids
what did this help us identify
Secondary waves
outer core
what was the downfall of Wegener’s theory
coudlnt explain HOW the cont. were drifting apart
Primary effect of an EQ
groundshaking
EXs of secondary EQ effects (6)
fire
destruction
death
tsunami
ground failure
liquifaction
what BASIC scale is used to measure EQ magnitude
Richter scale
what scale takes into account the amt of ground displacement along a fault + the type of ground involved for LARGE EQs
Moment Magnitude scale
2 reasons why damage was so severe in the mexico city EQ
one a filled in lakebed= SOFT GROUND
buildings not up to EQ codes bc of corruption (poor building)
Japan, Tonga islands, Aleutian islands all =
Volcanic Island Arcs
(T/F) seismic waves travel at same speed through earth
F
(T/F) ground shaking inc at sites w soft surface/soil layers
T
(T/F) The big island, Hawai’i. is the oldest island in the volcanic chain
F
its the youngest
instrument used to measure seismic waves
seismograph
print out of information from a seismograph
seismogram
huge ocean wave caused by shock to seafloor
tsunami
earth’s internal layer w/ the greatest volume
mantle
Hawaiian Islands & yellowstone formed over what tectonic feature
hot spots
serious phenomenon likely to occur during at least a moderate EQ in area underlain by landfill/soft soil
liquifaction
modern technology used to monitor the rate & direction of plate movement
GPS
what tectonic setting caused the 2004 sumatra tsunami
converging plate boundary, subducting plate got caught, snapped back into place
(C, D, T) Pacific plate meets australian plate
C
(C, D, T) iceland
D
(C, D, T) indian plate + eurasian plate
C
Pacific plate + N american plate at aleutian islands
(C, D, T)
C
what causes nearly all EQ-related deaths
collapsing buildings/structures
besides an EQ, what other events could cause a tsunami
Meteorites
volcanic erruption
submarine landslide
Southern california accounts for ____% of the nations EQ risk
50
very first national park est
yellowstone
mexico city EQ est organized _____________
search & rescue teams
equator = reference line for ____
latitude
a circular/oval UPFOLD
dome
what type of fold is the massanutten mtn
syncline
Circum-pacific EQ belt follows what volcanic zone
ring of fire
what name is given to a fold that has been OVERTURNED on its side
recumbant
Death valley + others in great basin are bounded by _____ on e side
normal
(C, D, T) btwn N american plate + pacific plate @ california
T
(C, D, T) btwn Juan de Fuca plate & N american plate
C
what is it called when a fold is dying
a plunging fold
where does most crustal deformation occur?
plate boundariesf
force applied to an area
stress
3 stages of deformation
1) elastic
2) plastic
3) failure/faulting
factors influencing the strength of a rock/how it will deform (4)
1) temp (warmer=more elastic)
2) confining pressure/depth
3) rock type (sed=weaker)
4) time
Which deformation is permanent
elastic or plastic
plastic
Folding:
what stress?
elastic of plastic?
tectonic setting
compression
plastic
convergent
large, step-like folds in otherwise horizontal sedimentary strata/layers
what usually causes them
monoclines
buried faults
causes rock layers to fracture, break into blocks, NO MOVEMENT
joints
Jointing:
tectonic setting?
stress?
ANYWHERE
ANY STRESS
significance of jointing (3)
1) mineral deposits along joint systems
2) highly jointed → hazard/risk to construction/groundwater contamination, etc
3) provides surface for weathering to occur
List the 4 eras in order
Precambrian time
Paleozoic Era
Mesozoic Era
Cenozoic Era
What era:
longest Eon, 88% of earth’s story
know the least abt it bc rocks have been recycled
Precambrian
What era:
soft, microbes, Added oxygen to atmosphere
*stromatalites/cynobacteria
Precambrian
What era:
***appalachians formed
great coal swamps formed (closer to EQ)
Shennendoah valley formed
Paleozoic
What era:
1st vertebrates-fish
1st amphibians/reptiles
1st land plants- gymnosperms (non-flowering)
**INSECTS
paleozoic
What era:
breakup of pangaea
**Rocky Mtns formed
mesozoic
What era:
Lots of REPTILES
some small mammals
1st flowering plants
AGE OF DINOSAURS
mesozoic
What era:
andes/himalayas forming
AGE OF MAMMALS
cenozoic
type of age-dating used to determine an order of events?
what type of rocks are best?
Relative
Sedimentary
type of age-dating using RADIOMETRIC methods to determine a NUMERICAL age
best type of rock
absolute
igneous
why are fossils important? (3)
1) help interpret geological past (climate/geography)
2) serve as time indicators
3) allow for correlation of rx from dif places (wegener)
fossilized impression
mold
fossilized filled in impression
cast
fossilized, mineral replacement, turned to stone
petrification
fossilization, carbon residue
carbonization
fossilization, any track/trail/marking/poop/gastroliths
trace fossils
conditions favoring fossil formation (2)
rapid burial to minimize decay scavenging
possession of mineralized pts (skeleton/shell) to make a mold
importance of stromatolites (2)
oldest known fossils
put oxygen into the atmosphere
what form stromatolites
cyanobacteria
evidence of stromatolites putting oxygen in atmosphere
Banded Iron formations
an unstable radioactive isotope
parent
spontaneous changes(decay) of atomic nuclei
radioactivity