Why does Earth's atmosphere contain much less carbon dioxide than Venus's atmosphere?
A) Earth's volcanoes did not outgas as much carbon dioxide as those on Venus.
B) Most of Earth's carbon dioxide was lost to space during the heavy bombardment.
C) Chemical reactions with other gases destroyed the carbon dioxide and replaced it with the nitrogen that is in the atmosphere now.
D) Most of Earth's carbon dioxide dissolved in the oceans, where it became incorporated into carbonate rocks.
E) Earth formed farther from the Sun, and there was less carbon dioxide at great distances in the solar nebula.
D) Most of Earth's carbon dioxide dissolved in the oceans, where it became incorporated into carbonate rocks.
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Which of the following types of Universe has no center and no edge?
a. closed b. flat c. open d. All of the other choices are correct.
The ratio of the circumference of any circle to its diameter is ?. Similarly, the ratio of the energy of any photon to its frequency is
1) h, Planck's constant, 2) uncertain, unlike ?, 3) the wavelength of the photon, 4) c, the photon's speed, which is 5) a basic constant of nature setting a lower limit on the smallness of things. 6) a basic constant of nature setting an upper limit on the speed of things.
A repelling force must occur between two charged objects under which conditions?
a. Charges are of unlike signs. b. Charges are of like signs. c. Charges are of equal magnitude. d. Charges are of unequal magnitude.
A high tide is occurring at Charleston, South Carolina (80°W, 33°N). At approximately what other longitude is a high tide occurring?
a. 100°E b. 80°E c. 60°E d. 40°E e. 20°E