The ________ of a substance is a measure of the average kinetic energy of the atoms and molecules in the substance.
Fill in the blank(s) with the appropriate word(s).
temperature
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Which landform is described as a steep-sided amphitheater depression or half bowl high on a mountain side at the head of a glacially eroded valley?
A) an arete B) a horn C) a cirque D) a tarn
What commonly used pesticide caused declines in bird populations in the 1950s and 1960s by weakening the shells of bird eggs?
A) 2,4-D B) Roundup C) Malathion D) DDT
Which of the following tends to reduce the magnitude of flooding?
A. Increasing vegetation B. Increasing drainage basin size C. Increasing ground cover by impermeable materials D. Increasing intensity and duration of rainfall
The current practice of geothermal power generation may not always provide a practical renewable energy source because ________
A) geologically heated groundwater is unsuitable for these plants and must be purified first B) in some cases, the heated groundwater is used much faster than it is recharged C) in many cases, the magma is used faster than it is recharged D) power plants have high maintenance costs E) in some instances, pollution emissions can be very high