A) unknown,but it is assumed to have been identical to today's
B) known to have stayed constant through geologic time,as shown by remnant magnetization of iron-rich minerals in rocks
C) known to have experienced numerous reversals,as shown by remnant magnetization of iron-rich minerals in rocks
D) known to have stayed constant through time,based on theoretical calculations
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Multiple Choice
A) Wegener could not provide a driving force
B) the continents did not fit together tightly enough
C) the fossil evidence was inconclusive
D) the distribution of climatic belts did not make sense in that configuration
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A) meteorite impacts
B) lightning strikes
C) tectonic plates shifting
D) changes in circulation patterns in the inner core
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A) Africa
B) Europe
C) North America
D) Australia
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A) along mid-ocean ridges
B) along fracture zones
C) at the edges of ocean basins
D) in the center of abyssal plains
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A) dipole
B) magnetic declination
C) magnetic inclination
D) polar wander
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A) mid-ocean ridges
B) fracture zones
C) continental coastlines
D) continental shelves
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A) aligned north to south along the prime meridian
B) aligned east to west along the equator
C) combined to form a supercontinent he termed Rodinia
D) combined to form a supercontinent he termed Pangaea
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A) India
B) southern Africa
C) North America
D) Antarctica
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A) till and striations
B) backwash and striations
C) till and grabens
D) backwash and grabens
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Multiple Choice
A) The continents move relative to the magnetic poles.
B) The magnetic poles move relative to the continents.
C) The polar-wander curve for each continent is unique.
D) The movement of the magnetic poles is much greater than the movement of the continents.
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Multiple Choice
A) a meteorite must have struck the area
B) the area was once covered with swamps and/or jungles
C) the area was once covered with an ocean
D) this discovery was anomalous
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A) magnetite
B) iron
C) quartz
D) potassium feldspar
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Multiple Choice
A) can be used to infer the ancient climate of the Earth;they are deposited in environments that are restricted to warm climate
B) automatically provide age information;all such deposits occurred between 200 and 400 million years ago
C) are deposited in warm climates today,but there is good reason to think that they were deposited in cold climates millions of years ago
D) pinpoint the locations of old subduction zones
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A) oceans
B) continents
C) mid-ocean ridges
D) plate tectonics
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A) been remarkably constant through time
B) changed through time,but are the same everywhere on Earth today
C) changed through time,and today vary between 1 and 10 m/yr
D) changed through time,and today vary between 1 and 10 cm/yr
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Multiple Choice
A) global warming
B) magnetic storms on the surface of the Sun
C) magnetic polarity reversals
D) apparent wander of the magnetic poles
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Multiple Choice
A) volcanoes also regularly occur
B) the tectonic plates are not moving
C) the geothermal heat flow is abnormally low
D) marine magnetic anomalies are not found
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Multiple Choice
A) Ginkgo
B) Glossopteris
C) Neuropteris
D) Quercas
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Multiple Choice
A) ridge axis
B) abyssal plain
C) guyot
D) trench
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