The green flash
A) is best seen through cirrostratus clouds.
B) requires the presence of ice crystals.
C) occurs because green light is scattered more readily than blue light.
D) involves both refraction and dispersion.
E) is most readily observed when the observer is in a mountain valley.
D
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Which of the following makes up the largest percentage of U.S. municipal waste?
A. yard trimmings B. metals C. food scraps D. plastics E. paper
Since 1975, atmospheric temperatures on Earth have ____.
A. experienced extreme fluctuations from hot to cold B. been increasing C. decreased D. remained constant E. not changed
In highlands, topography influences ecosystems by limiting the number of microclimates present to only one or two
a. True b. False Indicate whether the statement is true or false
World population has now stabilized because of limitations imposed by resource shortages.
Answer the following statement true (T) or false (F)