Which of the following is not true of chlorofluorocarbons?
A) CFCs role in depleting ozone has yet to be confirmed.
B) They are used to make foam products.
C) They have been used as propellants in spray cans.
D) CFCs are stable under conditions at Earth's surface.
E) They are used in refrigeration systems.
Ans: A) CFCs role in depleting ozone has yet to be confirmed.
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Why are buried oil and gas pipelines vulnerable to damage during a flood?
a. The pipes rise with the rising water level, causing the pipes to break. b. The large amounts of sediment flowing during a flood puts additional pressure on the pipes. c. Channel scour can erode down to the pipeline level, and tumbling rocks can sever the pipe. d. When the levee is overtopped, the dropping water level can expose the pipe, leading to damage. e. If the oil and gas are shut off, the pipe becomes lighter and can float to the bankfull level.
The _______________ cycle concerns variations in the tilt of Earth's axis
Fill in the blank(s) with correct word
Which of the following statements is TRUE?
A) The Northern Hemisphere vernal equinox is the Southern Hemispheres winter solstice. B) The Northern Hemisphere vernal equinox is the Southern Hemispheres autumnal equinox. C) The Northern Hemisphere vernal equinox is also the Southern Hemispheres vernal equinox. D) The Northern Hemisphere vernal equinox is the Southern Hemispheres summer solstice.
Typically, a lightning flash will have ____ leaders, each followed by a return stroke
a. one or two b. two or three c. three or four d. four or five e. five or six