What is the origin of curved ridges (R on this figure) in the Great Lakes area?
A) Folds produced during a continental collision
B) Paths of ancient rivers
C) Piles of sediment deposited by retreating glaciers
D) Remnants of a meteoroid impact
C) Piles of sediment deposited by retreating glaciers
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Prior to the discovery of radioactivity in the late ____________________ century, geologists were
able to develop a(n) ____________________ geologic time scale. Fill in the blank(s) with the appropriate word(s).
Prominences and solar flares present dangers to astronauts primarily because ________
A) they can overheat the spacecraft. B) they do not pose a danger to astronauts. C) they disrupt communications on earth D) they pose a radiation danger from X-rays and gamma rays, but primarily from high-energy particle emissions.
All of the following statements apply to ocean spreading centers, except ________.
A. they are the location of volcanism B. they are typically shallower than surrounding abyssal plains C. they are characterized by deep earthquakes D. they are part of mid-ocean ridge systems E. they are a divergent boundary
The forced collectivization of agriculture brought about a devastating famine in 1932-33, in which between six and eight million people starved to death.
a. true b. false