Water loss through evaporation exceeds input for much of the land area of the United States
What will be an ideal response?
This is especially true of the arid western states. (See also the answer to Question
21-9, which addresses this same issue.)
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Which forms of light are lower in energy and frequency than the light that our eyes can see?
A) infrared and radio B) ultraviolet and x-rays C) visible light D) infrared and ultraviolet
You find a mysterious rock on the ground and determine that 60% of its uranium-235 has been converted into lead-207. What is the most likely origin of the rock, based on its radiometric age?
A) It's older than our solar system, so it must have come from another solar system. B) It's a meteorite dating back to the formation of the solar system. C) It's a volcanic rock nearly a billion years old. D) It was just formed this year during the eruption of a nearby volcano.
New stars are most likely to form in
a. the central bulge of the galaxy, where star density is higher. b. small, individual clouds of cold, dense gas and dust collapsing to form single stars or binaries. c. regions of ionized hydrogen near young, massive O and B stars (H II regions). d. immense clouds of cold, dense gas and dust up to 300 light-years across.
The average density of Earth is ________.
A. about 1 g/cm3 B. about 1 cm3/g C. about 5.5 g/cm3 D. about 5.5 cm3/g