Practice Quiz

NAEP Science Grade 12 - Question List

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91.
An occluded front typically forms under which of the following conditions?
  1. A wedge of cool air between two warm fronts is forced upward as one of the fronts overtakes the other.
  2. A cold front catches up with a warm front, forcing warm air between the fronts upward and producing rain.
  3. A wedge of cold air between two warm fronts is forced upward as one of the fronts overtakes the other.
  4. A cold front overrides another cold front, trapping warm air at the surface and producing rain.
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92.
Which of the following climate characteristics is the primary factor controlling the type of vegetation in the prairie of the upper Midwest?
  1. Strong seasonal winds
  2. Limited annual precipitation
  3. Regular grass fires
  4. Temperature extremes
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93.
The polar jet stream typically has a major effect on the weather of the northern half of the United States. Which of the following is a major factor responsible for increasing the wind speed in the region of the polar jet stream?
  1. The geographical shift in temperature patterns associated with the different phases of the Arctic Oscillation.
  2. The gradual drop in pressure that occurs between the troposphere and stratosphere.
  3. The steep pressure gradient that exists between very cold northern air and warmer southern air.
  4. The seasonal change in atmospheric instability over temperate and tropical oceans.
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94.
Fossil evidence indicates that tropical conditions once existed across the United States during the late Paleozoic era. This difference in the climate of North America today and the climate during the Paleozoic era was caused primarily by changes in the: 
  1. Concentration of oxygen in the atmosphere.
  2. Intensity of solar radiation.
  3. Directions in which ocean currents flow.
  4. Positions of the continents.
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95.
Approximately 14,000 years ago, warmer conditions began to melt the Pleistocene ice sheets. This warming was suddenly interrupted around 12,700 years ago by 1,000 years of below- average temperatures in northeastern North America and northern Europe. The onset of this sudden and prolonged cold snap, known as the Younger Dryas event, was caused primarily by which of the following?
  1. A reduction in tropical air masses moving north due to a shift in the position of the subtropical jet stream
  2. A change in the ocean currents in the North Atlantic caused by an increased input of freshwater.
  3. A decrease in the intensity of solar energy output due to changes in the Sun's magnetic field.
  4. A change in the timing of the seasons caused by variations in Earth's orbital parameters.
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