About how much of the sun's radiation would strike the Earth if the Earth did not have its atmosphere?
A) About 10 times more
B) About twice as much
C) About the same amount
D) About half as much
B
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Which of the following radioactive isotopes would be best for age-dating a rock from 50,000 years ago?
A) uranium-238 B) carbon-14 C) potassium-40 D) thorium-232
Why do coral reefs at the ocean surface grow away from seamounts over time?
a) Seamounts uplift as tectonic plates move. Coral reefs grow away from the seamount in order to stay in the ocean water. b) Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight. c) Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay in the ocean water. d) Seamounts uplift as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight.
Infectious diseases are a much greater problem in developing countries than in developed nations. In developing countries, such diseases account for nearly half of all deaths. This is because ________
A) developing countries generally lack many of the health and medical services found in developed countries B) virtually no developed nation is willing to help the developing countries with their infectious disease problems C) most of the developing countries are in tropical climates and medicines don't work well in these climates D) even when medical care is available, many people in developing nations do not have the money to pay for it E) Both A and D.
Why does the intensity of a hurricane diminish rapidly when it moves over land?
What will be an ideal response?