Although it currently does not have an ocean, ____ is thought to have had one in the distant past
a. Europa
b. Saturn
c. Jupiter
d. Mars
ANS: D
Mars shows signs there might have been an ocean on its surface. It is possible this ocean occupied low
areas of the planet's northern hemisphere. This would have existed as much as 3.2 billion years ago
when conditions were warmer. The red planet might have even had as much carbon dioxide in its
atmosphere as early Earth. Information can be found in the section Are There Other Ocean Worlds.
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Most of the carbon dioxide in the atmosphere is the result of human activities
Indicate whether the statement is true or false
A tsunami breached the 40-foot seawall at the Daiichi nuclear power plant in Honshu, Japan, in 2011. What was the disastrous result?
A. a leak of radioactivity from the power plant B. a nuclear explosion C. a tidal wave that washed away buildings along the shore D. thermal pollution
If a rock is exposed to such high temperatures that it melts, it forms a(n) ____________________ and
becomes a(n) ____________________ rock. Fill in the blank(s) with the appropriate word(s).
In Los Angeles, photochemical smog
A) is relatively uniform throughout the metropolitan area. B) is relatively constant throughout the day and night. C) varies throughout the day and night. D) varies throughout the day and night and is relatively uniform throughout the metropolitan area.