Old Faithful, in Yellowstone National Park is an example of a ________
Fill in the blank(s) with the appropriate word(s).
Answer: geyser
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The presence of microscopic slush in water tends to make the water
A. more dense. B. less dense. C. warmer. D. slipperier.
A key characteristic of aquatic dead zones is ________
A) a high concentration of organisms resulting in extreme competition and finally the death of most B) a low concentration of nitrogen and phosphorus nutrients C) a low concentration of keystone species D) a low concentration of oxygen E) a high concentration of urban development
Gases are ________ of the atmosphere
A) evenly mixed throughout all levels B) unevenly mixed throughout all levels C) evenly mixed in the upper layers D) unevenly mixed in the lower layers E) evenly mixed in the lower layers
When the input piston of a hydraulic cylinder is depressed 20 cm, the output piston moves 1 cm. This means that an input force of 1 N can raise no more than
A. 1 N. B. 10 N. C. 21 N. D. 20 N.