For the last 100 years, our primary energy source has been ________
A) fuel wood
B) nuclear energy
C) fossil fuels
D) natural gas
E) hydropower
Answer: C
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In practice, the USSR operated as a
A) unitary state. B) republic. C) monarchy. D) federation.
How deep is the photic layer usually along the coasts?
A) 50 meters B) 100 meters C) 150 meters D) 590 meters
The asthenosphere ________.
A) exists below a depth of 100 kilometers B) is a subdivision of the outer core C) exists below a depth of 700 kilometers D) is a zone of strong mater
If you have an aquarium with saltwater fish, 75 percent of your fish probably came from
A. Captive breeding programs in the United States B. Captive breeding programs in Indonesia or the Philippines C. Hybrid crosses of native U.S. fish D. Aquaculture programs in South Pacific countries E. Wild fish populations caught with cyanide or nets