A ________ is a small, circular lake that occupies a cirque basin
A) drift
B) marsh
C) tarn
D) fenster
Answer: C
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Which of the following elements are in the same group as silicon (Si)?
A. P B. C C. B D. As E. none of the above
The potential energy of Earth when orbiting the Sun is greatest when
A. approaching the Sun. B. at its greatest distance from the Sun. C. receding from the Sun. D. closest to the Sun.
Warming temperatures melt ice cover, exposing a darker surface that absorbs more solar radiation. In response, the air warms even further. This is an example of:
A) a positive feedback mechanism. B) a stable-feedback mechanism. C) a negative feedback mechanism. D) a variable-feedback mechanism.
Of the following temperatures, which of the following is closest to the official low temperature in degrees Celsius (and degrees Fahrenheit) ever recorded on Earth?
A) 0 (32) B) -10 (14) C) -50 (-58) D) -100 (-148) E) -140 (-228)