If the path of polar wandering recorded on two continents is not the same, then we can say that
A) Earth's magnetic history has been very complex.
B) at least one of the continents has moved.
C) our radioactive dating techniques have been inaccurate.
D) the continents have always been widely separated.
B
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Which of the following best describes air circulation at high latitudes?
A) Cold dense air rises at the poles, flows outward away from the poles, and rises between 60 and 45 degrees latitude. B) Cold dense air sinks at the poles, flows outward away from the poles, and rises between 60 and 45 degrees latitude. C) Cold dense air sinks at the poles, flows outward away from the poles, and sinks between 60 and 45 degrees latitude. D) Cold dense air rises at the poles, flows outward away from the poles, and sinks between 60 and 45 degrees latitude.
Some lava flows show a pattern of columns bounded by fractures. These columns are usually ____-sided
A)three B)six C)eight D)twelve E)twenty
Nighttime radiation inversions occur on most ____ nights
A) clear, windy B) rainy, windy C) clear, calm D) rainy, calm
Different patches across a landscape may be at different successional stages
Indicate whether the statement is true or false