Explain the differences in air motion within a low pressure system and a high pressure system
Horizontal pressure differences create a force that starts the air moving from higher pressure toward lower pressure. Because of the earth's rotation, the winds are deflected from their path toward the right in the Northern Hemisphere. This deflection causes the winds to blow clockwise and outward from the center of the highs, and counterclockwise and inward toward the center of the lows. As the surface air spins into the low, it flows together and is forced upward, like toothpaste squeezed out of an upward-pointing tube. The rising air cools, and the water vapor in the air condenses into clouds. In regions of high pressure, skies are generally clear. As the surface air flows outward away from the center of a high, air sinking from above must replace the laterally spreading surface air. Since sinking air does not usually produce clouds, we find generally clear skies and fair weather associated with the regions of high atmospheric pressure.
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Strains of genetically modified food crops can hybridize with wild crop varieties when
a. The process is carefully controlled in an agricultural lab. b. Pollen blows from the genetically modified crop and spreads among wild varieties. c. Pollen is transferred by the farmer from one crop to the other. d. It is not possible for a genetically modified plant to hybridize with a wild species. e. More than one of these answers is correct
What is the scale of this map? What is the contour interval?
Refer to Figure 26.6 Topographic Map of Duncans Mills and Arched Rock, CA and Figure 26.8 Aerial Imagery of Duncans Mills and Arched Rock, CA. What will be an ideal response?
Which of the following processes are unidirectional global changes?
a. The evolution of the solid Earth and life b. The evolution of the atmosphere and oceans c. The evolution of the supercontinent cycle d. Both b and c e. Both a and b
The lowest surface air pressures ever recorded are associated with
A) cold and dry climates. B) frontal systems (cold and warm fronts). C) sea level. D) hurricanes (typhoons).