What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 10^6 m, and atmospheric pressure at the surface is 105 N/m2.)
a. 5 × 10^16 kg
b. 1 × 10^18 kg
c. 5 × 10^18 kg
d. 1 × 10^20 kg
c
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Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) The maria formed after the heavy bombardment ended. B) The maria formed within the past 1 billion years. C) The regions of the maria were hit by fewer impacts than the densely cratered regions. D) Erosion affects the maria more than it affects other regions of the Moon.
The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, and Neptune. C) Mercury, Venus, Earth, Mars, and Pluto. D) Jupiter, Saturn, Uranus, Neptune, Pluto, and Eris.
Sim-Planet: Make the difference between the night and day temperatures larger
A) Increase the tilt of the planet's rotation axis. B) Increase the greenhouse gas content of the planet's atmosphere. C) Move the planet closer to the Sun. D) Make the planet rotate more slowly.
If all the "dark matter" in our universe were to be instantaneously removed, which of the following would not happen?
A) The Milky Way would fly apart. B) Clusters of galaxies would fly apart. C) The universe would expand forever. D) The Solar System would fly apart. E) All of the above