What evidence was used to support magnetic pole reversals?
A) apparent polar wandering and alternating magnetic stripe patterns on the ocean floor
B) paleomagnetism
C) normal and reverse polarity
D) continental drift and seafloor spreading
Answer: A
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Moonquakes on the Moon were detected by:
A) the radar observations over time from Earth. B) the seismographs left these by the Apollo astronauts. C) laser beams reflected off mirrors left on the Moon by Apollo missions. D) seismographs attached to the Russian Lunar rovers. E) telescopic observations of lunar landslides.
Because the Hubble constant equals 70 km/s/Mpc, a galaxy with a recession velocity of 4,900 km/s would be a distance of ____ Mpc from Earth
a. 0.014 b. 70 c. 4930 d. 4970 e. 343,000
The composition of Earth's atmosphere today is about 78% ________, 21% ________, and about 1% ________, with trace amounts of other gases.
A. nitrogen; carbon dioxide; oxygen B. nitrogen; oxygen; argon C. nitrogen; oxygen; carbon dioxide D. oxygen; nitrogen; water vapor E. oxygen; carbon dioxide; nitrogen
What are stars made of?
A: Gases, primarily Hydrogen, then Helium B: Nothing but light and energy C: Trick question- we really don't know D: Pretty much the same as Earth, but with a special shell E: They're fireflies stuck in the big blue/black thing