How can one layer, in a core extracted from a bog, reveal a climate of the past?
Pollen grains in the mud indicate the types of plants that lived in the area at a particular time, and can be used to infer past climate conditions.
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Consider the ratio of oxygen 18 to oxygen 16 in the shells of organisms that lived in the sea during the geologic past. Which of the following describes the relationship between this ratio and the climate at that time?
A. the higher the ratio, the drier climate at that time B. the higher the ratio, the wetter climate at that time C. the higher the ratio, the colder climate at that time D. the higher the ratio, the warmer climate at that time
In which direction is the Souris River flowing? How can you tell?
The following questions are based on Map T-4, a portion of the “Voltaire, North Dakota” quadrangle (scale 1:24,000; contour interval 5 feet) and Figure 40-4, a stereogram of the same region showing the Souris River (48°06'23"N, 100°48'05"W). What will be an ideal response?
Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate
A) the same distance as the slower arrow. B) twice as far as the slower arrow. C) four times as far as the slower arrow. D) more than four times as far as the slower arrow. E) none of the above
In 1962, Rachel Carson published Silent Spring, which dramatized the potential dangers of ________ to food, wildlife, and humans and eventually led to changes in the United States on their use.
Fill in the blank(s) with the appropriate word(s).