Biofuels are ________
A) fuels that use electrical currents to power automobiles
B) batteries that fuel automobiles and buses
C) fuels that are derived from plant material
D) batteries that derive energy from plant material
E) devices that directly convert fuel to electrical currents
Answer: C
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On a weather map, which of the following signifies the transition zone between two air masses with sharply contrasting properties?
A. the letter "L" B. the words "air mass weather" C. the letter "H" D. a front
The North American Spring Wheat Belt is centered in
A) Minnesota, North Dakota, South Dakota and Saskatchewan. B) Saskatchewan, North Dakota South Dakota and Kansas. C) North Dakota, South Dakota, Alberta, and Nebraska. D) Minnesota, North Dakota, South Dakota and Kansas. E) Minnesota, North Dakota, South Dakota and Nebraska.
Cloud formation is an example of _____ and _____ the air.
A) evaporation; cools B) condensation; cools C) evaporation; warms D) condensation; warms E) sublimation; cools
Ice sheets can be ________
A) several kilometers thick B) tens of kilometers thick C) several centimeters thick D) several meters thick