Sunspots are dark because they are
A. holes in the photosphere, allowing astronomers to view into the Sun's interior.
B. land masses like continents on the Earth.
C. slightly cooler regions meaning they emit less light than the surrounding areas.
D. shadows from clouds in the Sun's atmosphere.
Answer: C
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In the early history of the earth, the solid surface of the earth weathered more rapidly than now because ________
A) the atmosphere contained large amounts of corrosive methane B) the early rain was very acidic C) there were numerous earthquakes and volcanoes breaking up the surface D) the rocks at the surface were weak because there was little oxygen available E) there was little topography so shallow water washed across the surface often
In the United States, the use of synthetic pesticides has increased 10-fold between 1942 and 1997 . For the same time period, the crop loss to insects has
a. declined by 10% b. increased by 2% c. almost doubled from 10% to 13% d. stayed at exactly the same percentage e. declined by 50%
In ________ environment, a rising air parcel will sink back to its original altitude
a. a neutral b. a stable c. an unstable d. None of these choices.
The Dutch have responded to the challenge of global warming by
A) building extensive dams further from the shore to protect the coastline. B) building extensive seawalls. C) embracing alternative renewable energy sources such as wind and solar power. D) converting to geothermal energy. E) converting to food imports only.