What can make a setting (or rising) Sun appear red?
What will be the ideal response?
ANSWER: At sunrise and sunset, the rays coming directly from the Sun strike the atmosphere at a low angle. They must pass through much more atmosphere than at any other time during the day. (When the Sun is 4° above the horizon, sunlight must pass through an atmosphere more than 12 times thicker than when the Sun is directly overhead.) By the time sunlight has penetrated this large amount of air, most of the shorter waves of visible light have been scattered away by the air molecules. Just about the only waves from a setting Sun that make it on through the atmosphere on a fairly direct path are the yellow, orange, and red.
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The spread of desert regions through a combination of human and natural factors is termed ____________________
Fill in the blank(s) with correct word
As population increases,
A. natural systems will continue to compensate adequately for such disruptions as pollution; the earth is a big place. B. growing demand for resources will ensure that more will always be found. C. demand for resources will tend to increase. D. All of the choices are correct.
Ediacaran faunal fossils are rare because they ____
a. existed for a short time b. lived in a narrow geographic range c. were soft-bodied animals d. are the oldest animal fossils e. were oxidized in the Great Oxygenation event
Dessication is the biggest issue for rocky shore benthos living in the ________.
A. sublittoral B. supralittoral C. pelagic zone D. neritic zone E. littoral