What is the importance of the carbon dioxide (CO2) cycle?
A) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate.
B) It makes the growth of continents possible.
C) It allows for an ultraviolet-absorbing stratosphere.
D) It will prevent us from suffering any consequences from global warming.
A) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate.
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During which step in the above figure would you determine the use of bars, menus, and tabs?
A. Step 3 B. Step 4 C. Step 5 D. Step 6
How is the GAIA mission relevant to the search for extrasolar planets?
A) It can detect planets through the astrometric method. B) It can obtain moderate-resolution images of extrasolar planets. C) It can detect planets through the Doppler method. D) It can detect planets through the transit method.
How have astronomers measured the acceleration of the universe?
A) by measuring changes in galaxies' redshifts from year to year B) by comparing lookback times for white-dwarf supernovae (by measuring their apparent brightness) with the average distance between galaxies (based on their cosmological redshifts) C) They have not. It is a purely hypothetical idea.
What is the length of a simple pendulum with a period of 2.00 s?
A) 19.6 m B) 0.994 m C) 1.22 m D) 1.62 m E) 0.873 m