What of the following is considered to be the most likely cause of the Quaternary Ice ages?
A) human activity releasing "greenhouse" gases
B) variations in the Sun's intensity
C) variations in the earth's orbit
D) plate tectonics moving continents to polar regions
C
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Because a much greater extreme in daily air temperatures exists near the ground than several feet above, the ____________________ for small plants is far more harsh than the thermometer in an instrument shelter would indicate
Fill in the blank with correct word.
What is the wavelength of an electromagnetic wave that has a frequency of 3 kHz?
A) less than 1 km B) 1 km C) more than 1 km
The process of converting a liquid to vapor is termed ________
A) melting B) evaporation C) condensation D) sublimation
The tornado alley of the United States ____
a. stretches from North Dakota to southern Texas b. stretches from the Rocky Mountains to the Mississippi River c. stretches from central Texas to Nebraska d. occurs over Mississippi and Alabama e. occurs over the Gulf Coast states