Which of the following is true?
a. Young soils are characterized by well-developed horizons.
b. Soils become mature when they are ten thousand years old.
c. The older the soil, the more parent material influences soil characteristics.
d. Some of the world's best soils are formed from volcanic and transported parent material.
D
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A lamp rated 23W 120V means that it will deliver 23 W
A. whether or not it is connected to 120 V. B. when the voltage across it is 120 V. C. as long as the current is ac. D. none of the above
Ice ages
A) have not occurred for several million years. B) have not affected North America. C) have been more severe because of plate tectonics. D) are more severe when the continents are closer to the equator. E) all of the above
Highly productive areas of coastal upwelling are found along the ________ margins of continents, where surface currents are moving ________ the equator
A) eastern; away from B) eastern; toward C) western; away from D) western; toward
Due to changes in the intensity and amount of ____, polar climates are found at high latitudes and tropical climates at low latitudes
a. ?temperatures b. ?precipitation c. ?photosynthesis d. ?solar energy e. ?evaporation