Which of the following methods has the highest irrigation efficiency?
A) drip irrigation
B) surge irrigation
C) flooding fields
D) aerial sprinkler systems
E) low-energy precision application sprinklers
Answer: A
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This wind-blown dust deposit (loess) from Tibet
A) was deposited by a huge flood of seawater that covered the land at the time of the dinosaurs.
B) began as clay and silt that were produced by grinding of rocks along ice-age glaciers.
C) forms a worldwide layer associated with a well-known extinction of dinosaurs.
D) All of these are correct.
Methane, nitrous oxide, and halocarbons
A) are not as potent as carbon dioxide and water vapor. B) exert a negative radiative forcing effect in the atmosphere. C) are all potent greenhouse gases but at present are less of a threat for climate change than carbon dioxide. D) are removed from the atmosphere as fast as they enter and pose no threat of climate change.
A car that travels twice as fast as another when braking to a stop will skid
A) twice as far. B) four times as far. C) depends on the mass of the cars
The rate of movement of contaminants in an aquifer can be calculated using the:
a. hydrodynamic dispersion b. average linear velocity c. hydraulic conductivity d. hydraulic gradient