Urban soils generally contain no organic matter, but may have bits of broken glass and other human debris

Indicate whether the statement is true or false


FALSE

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Which of the following tasks is not associated with surface mining?

A) Miners dig tunnels in the earth B) Supports and pillars are used to support the mine roof C) Additional interconnecting passages are dug D) Explosives are used to move quantities of earth away from the deposit

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Good watering practices will reduce plant damage caused by low humidity

Indicate whether the statement is true or false

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The outcome of an electric shock is based on _____

A) the amount of resistance in the circuit that produces the shock B) the amount of current that flows through the body C) the voltage level of the circuit that produces the shock D) whether the power is AC or DC

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A filtered full-wave rectifier voltage has a smaller ripple than does a half-wave rectifier voltage for the same load resistance and capacitor values because

a. of the longer time between peaks. b. the larger the ripple, the better the filtering action. c. of the shorter time between peaks. d. None of the above.

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