Which one of the following characteristics does not contribute to ozone depletion over Antarctica?
A. Temperatures above -80°C
B. Stratospheric clouds
C. Higher concentrations of CFCs than elsewhere
D. Polar vortex
Answer: A
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Why is it that most top predators (e.g., lions, tigers, bears, and wolves) have extremely large territories and are relatively rare?
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The term "Third World" was originally a product of which of the following?
A) a United Nations ruling B) World War II C) asymmetrical warfare associated with terrorism D) the Kyoto Protocol E) the Cold War
Which of the following results from the South Pole remaining snow- and ice-covered all year long, while the North Pole is surrounded by ocean?
a. ?The Southern Hemisphere is colder than the Northern Hemisphere. b. ?The Northern Hemisphere is colder than the Southern Hemisphere. c. ?The Southern Hemisphere receives more precipitation than the Northern Hemisphere. d. ?The Northern Hemisphere receives more precipitation than the Southern Hemisphere. e. ?The equatorial region is the warmest region of the world.
On the average, sunlight received on the Earth's surface is only ________ as strong as that received at the edge of its atmosphere
A) 1/100 B) 1/10 C) 1/4 D) 1/2 E) 1/8