Which oceanographic sampling device played a large role in verifying the plate tectonic theory?
a. boxcore sampler
b. clamshell sampler
c. piston corer
d. seismic profiler
e. acoustic Doppler profiler
c
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The variety of the earth's species and ecosystems is called ____________________.
Fill in the blank(s) with the appropriate word(s).
The Earth's magnetic field [location of north and south magnetic poles] is constant.
a. true b. false
Niagara Falls were formed _______.
a - during Precambrian time approximately a billion years ago b - so long ago that the river's knickpoint is now gone c - after a series of spectacular earthquakes which are still helping the falls evolve d - by humans as a result of the damming of the St. Lawrence river e - after the retreat of the Pleistocene ice sheets a few thousand years ago
From where does the food that most city-dwellers consume originate?
A) farms surrounding the suburbs and from long distances away from the city B) technologically advanced underground farms C) factories that produce food from plastic D) farms within the city limits