Which of the following chemicals is most likely to be the limiting nutrient in the surface waters of the ocean?
A. calcium.
B. silicon.
C. carbon.
D. phosphorous.
E. cadmium.
Answer: D. phosphorous.
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Electric charge flows in an electric circuit when
A. the circuit is grounded. B. electric resistance is low. C. a potential difference exists. D. electric devices in the circuit are not defective.
What was first created in an effort to claim the resources of the continental shelf as belonging to the nation to which it
was attached? a. The Marine Mammal Protection Act b. The Law of the Sea c. The International Whaling Commission d. The National Marine Fisheries Service e. U.S. Exclusive Economic Zone
Moreno (Brunette/Olive) and Moreno Claro (Light Brown) represent
A) census options.
B) enclaves in Rio de Janeiro.
C) Brazilian self-identification.
D) the same thing as Pardo (brown) on the census.
E) cultural distinctions.
Variations in Earth's orbit that influence long-term climate changes include ________
A) the shape of Earth's orbit (eccentricity) B) the tilt of Earth's axis of rotation (obliquity) C) the wobbling of Earth's axis of rotation (precession) D) eccentricity, obliquity and precession