Ice Ages ____
A)have occurred regularly through Earth's history
B)have glacial episodes separated by very short interglacial stages
C)result from declines in sea level
D)are the result of variations in the amount of solar heat received
E)occur whenever accumulation of snow exceeds wastage
D
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On March 21, the sun will be directly overhead at
A) A.
B) B.
C) C.
D) D.
In the 1980s, the United States, Saudi Arabia and Pakistan provided weapons and training to enable Islamic freedom fighters known as the ________ to drive the Soviets out of Afghanistan
A) mujahideen B) Taliban C) Islamic Jihad D) Soviet-Islamic Militia E) Al-Qaeda
An example of a density-independent factor would be ________
A) a plant parasite, such as mistletoe B) blight (a mold disease) in a wheat field C) cold weather causing a lake to freeze D) suitable nest sites for a flock of warblers E) a specialist searching for the one species of plant that is its food
Which of these climates would be found closest to the equator?
a. humid continental, hot summer b. humid subtropical c. humid continental, mild summer d. tundra e. subarctic