If water is so abundant on Earth, why are water resources such a big concern?
A) Water resources are not necessarily where humans need them and when they need them.
B) Humans are not very adept at exploiting water resources, so many go unused.
C) Most of the water on earth is frozen in polar ice sheets.
D) Most of the water is caught up in the hydrologic cycle and is therefore not readily available.
A
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What will be an ideal response?
Nine old, 12-ft2 windows with a U-value of U = 1.2 ./0 1·3/4·°F were replaced with new windows having U = 0.3 ./0 1·3/4·°F . Calculate the energy savings on a day during a five-hour period when Tin = 68oF and Toutside = 10oF.
What will be an ideal response?
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Indicate whether the statement is true or false
What is a serious hazard to aircraft?
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