Why should air temperature measurements be made in the shade?
It is impossible to measure air temperature accurately in direct sunlight because the thermometer absorbs radiant energy from the sun in addition to energy from the air molecules. The thermometer gains energy at a much faster rate than it can radiate it away, and the liquid keeps expanding and rising until there is equilibrium between incoming and outgoing energy. Because of the direct absorption of solar energy, the level of the liquid in the thermometer indicates a temperature much higher than the actual air temperature.
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Determine the discharge associated with a gage height of
In general, there is a direct relationship between discharge and width, depth (gage height), and velocity. A stream’s rating curve relates stream discharge to the gage height. Figure 22.1 shows the gage height plotted against discharge. Note that the discharge axis is logarithmic.
6 meters: _____________
9 meters: _____________
12 meters: _____________
15 meters: _____________
Adaptive management assumes that what seemed the best initial policy option will always remain so.
Answer the following statement true (T) or false (F)
Red color in soils results from
A. solution of quartz. B. hydrolysis of feldspar. C. oxidation of iron. D. solution of calcite.
The length of a tidal day for a mixed semidiurnal tide is ________ hours.
A. 12.4 B. 48 C. 24.8 D. 12 E. 24