If Earth is closest to the Sun in January, why is much of the Northern Hemisphere cold in January?
A) It is cold because it is winter.
B) The Southern Hemisphere is tilted away from the Sun in January.
C) Solar energy favors the equatorial regions.
D) The Northern Hemisphere is tilted away from the Sun in January.
Answer: D
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Discuss how astronomers know that our galaxy contains spiral arms in its disk
What will be an ideal response?
Low mass stars like our Sun can fuse in their cores
A) all of the chemical elements B) elements up to and including iron C) elements up to and including carbon D) only elements heavier than iron
A 100 kg mass has a density of 2000 
If the volume is decreased by 2% due to compression, then the density is
A. 3,010 
B. 2,940
C. 2,520
D. 2,440
E. 2,040
Which of the following is true about Neptune?
a) Its atmospheric composition and rings are most like Saturn's. b) Its atmospheric composition is most like Saturn's, but its rings aremore like thoseof Uranus and Jupiter. c) Its atmospheric composition is most like Uranus and its rings are likethose of Uranusand Jupiter. d) Its atmospheric composition and its rings are most like Jupiter's. e) It is more like the Earth than it is like any of the other giant planets.