The oceanic crust has an average age of ________ and a maximum age of ________
A) 200 million; 400 million
B) 80 million; 200 million
C) 100 million; 180 million
D) 90 million; 300 million
Answer: C
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When was the Younger Dryas period?
A. about 1,200 years ago B. about 120,000 years ago C. about 120 years ago D. about 12,000 years ago
Calcification is likely to occur in
A) areas characterized by coniferous forests. B) areas with Vertisols. C) tropical climate regions. D) arid, semiarid, and grassland environments.
Corals cannot survive for long when the water temperature exceeds ________ Celsius
A) 18° B) 22° C) 26° D) 30° E) 34°
In the formula I=PAT, which of the following would be representative of the 'A'?
A. Driving an SUV. B. Earning money to support the family. C. Having clean drinking water. D. The number of people living in a country.