The solar radiation curve is a graph of
A. colors of sunlight versus their frequencies.
B. colors of sunlight versus their wavelengths.
C. the path of the Sun circling Earth.
D. brightness versus frequency.
Answer: D
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A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After studying the rock for a while, he assumes it is obsidian. Why does he do so?
A) Obsidian is always hot. B) Obsidian forms underground. C) Obsidian is green. D) Obsidian forms in lava flows.
Flash floods are created by severe thunderstorms
Indicate whether the statement is true or false
Which factor most often causes voluntary migration?
A) economic B) environmental C) international D) political E) a regional conflict
The CAFE standard is a common term when referring to energy and environmental issues in the United States. The acronym CAFE stands for
a. Corporate Average Fuel Economy. b. Consumer Applied Funding Energy. c. Corporate Alternative Fuel Energy. d. Consume Alternative Fuel Energy. e. Corporate Alternative Fuel Employment.