Which of the following phenomena can sometimes be seen near the upper rim of a setting or rising sun?
A. corona
B. green flash
C. sun pillar
D. glory
Answer: B
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Dew point is the temperature at which water vapor in the air begins to condense. The temperature inside a cloud would therefore be:
A) about equal to the dew point. B) just above the dew point. C) below freezing. D) way above the dew point.
What is the world's largest use of one fuel?
A) biomass B) growing corn for ethanol C) recycling D) slash-and-burn agriculture E) wood for cooking
Over the past decade, the salinity of high-latitude oceans has ________ due to________
A) increased; ocean absorption of excess atmospheric carbon dioxide and associated coral die off B) declined; coastal erosion caused by changes in stream flow and increased precipitation C) increased; higher evaporation rates associated with climate change D) declined; freshwater inputs from melting ice E) increased; changes in thermohaline circulation associated with the Pacific Decadal Oscillation
The largest, longest-running citizen-science project in the world is
A. FrogWatch USA B. Great Backyard Bird Count C. Project Feeder Watch D. Sea Turtle Tally E. Christmas Bird Count