Which of the following is not an example of a point source?
A. a septic tank
B. effluent produced by a paper mill
C. a storm sewer outflow
D. runoff from pastureland
Answer: D
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Replacement of calcium (Ca) in limestone by magnesium (Mg) generally results in dolostone. Indicate whether the statement is true or false
The Sun is very hot, so it radiates _______ energy and the energy has a _______ wavelength than energy coming from Earth.
A) more; longer B) less; longer C) less; shorter D) the same; shorter E) more; shorter
When El NiƱo occurs every three to five years, a mass of warm Pacific water that is usually pushed westward by trade winds
A. Surges back eastward toward South America B. Becomes much warmer than usual, strengthening trade winds C. Surges northward toward Japan D. Cools dramatically E. Sinks and therefore cools substantially
True or False: Although the iron sank to the core, most of the "strongly" iron-seeking elements remained behind
Indicate whether this statement is true or false.