Which of the following determines the earth's temperature?
A. Energy output of the sun
B. Distance from the sun
C. Carbon dioxide in Earth's atmosphere
D. All options are correct.
Answer: D
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Vertebrates first appeared in the ____
a. Cambrian
b. Devonian
c. Permian
d. Mississippian
e. Ordovician
Fogs "burn off" from the ground up
Indicate whether the statement is true or false
The subpolar low (polar front) is ________
A) the boundary between frozen and liquid B) a zone where the polar easterlies and the westerlies converge C) the forward edge of the Antarctic ice cap D) a zone where the trade winds meet
Which biome occupies more than one-third of the Earth's land area and is characterized by xerophytic vegetation, low precipitation, and high potential evapotranspiration?
A) Mediterranean shrubland B) tropical savanna C) midlatitude grasslands D) boreal and montane forest E) deserts