The stratospheric ozone layer is important to ecosystems because it ________
A) ensures lakes and oceans do not lose water
B) provides the air we breathe
C) keeps atmospheric gases balanced
D) absorbs and scatters UV light
E) keeps the temperature of Earth stable
D
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The Pacific Decadal Oscillation
A) has a period of several months. B) has a period of several years. C) occurs over the equatorial Pacific. D) occurs over the North Pacific. E) has no effect on El Niño events.
When a resource is present in a fixed amount, it is said to be:
A) a nonextractive resource. B) a nonrenewable resource. C) a physical resource. D) a renewable resource.
The agricultural practice most dependent on being close to consumers is
A) mixed crop and livestock farming. B) livestock ranching. C) commercial gardening and fruit farming. D) grain farming. E) dairy farming.
In a sky filled with scattered cumulus humilis clouds, rising motions are found ____ the clouds and sinking motions are found ____ the clouds
a. between; above b. under; between c. under; under d. between; between e. above; under