____ backflow is a reversal of normal flow in a system caused by a negative pressure (vacuum) in the potable water supply.
a. Gravity
b. Back-siphonage
c. Back-pressure
d. none of the above
ANSWER: b
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a. turbidity b. hardness c. acidity d. dissolved iron
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What will be an ideal response?
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Garden mums are cultivated outdoors
Indicate whether the statement is true or false
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a. turns soil to mix the crop residue, livestock manure, lime, and fertilizer b. leaves the crop residue on the surface of the soil c. leaves a large ditch for irrigation purposes d. is no longer used because it encourages erosion
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