Relative to ultraviolet waves, the frequency of infrared waves is
A. about the same.
B. higher.
C. less.
D. not enough information
Answer: C
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The fertile soils of the Rift Valley are explained by
A) extensive glaciation during the last ice age. B) volcanic activity associated with the area. C) large-scale agricultural projects. D) voluminous river systems in the area. E) voluminous river systems and extensive glaciation.
What is the evidence that the outer core consists mostly of liquid iron? What is the evidence that the outer core contains elements other than iron?
What will be an ideal response?
Which one of the following illustrates interspecific competition?
A) Two honeybees from the same colony converge on a flower to collect pollen and nectar. B) Caterpillars of two different species of moth are feeding on the same plant's leaves. C) The largest wolves in a pack are the first to feed on a freshly killed deer. D) Advertising its nectar with red colors, a columbine flower attracts a hummingbird for a meal.
Consider the isotherm map of the United States shown above. Which of the following statements best describes the area between Las Vegas, NV, and Palm Springs, CA?
A) This area exhibits one of the greatest temperature gradients on the map. B) The average temperature in this area is below freezing. C) One would expect to encounter a temperature of 40°F if driving from Las Vegas to Palm Springs. D) This area exhibits one of the lowest temperature gradients on the map.