How many ice ages occurred in the first 2 billion years of Earth's history?
A) 0
B) 1
C) 2
D) 5
Answer: A
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When a tropical rain forest is clear-cut, the most likely impact to the environment is
A) loss of biodiversity. B) movement of oxygen from the biosphere into the atmosphere. C) increase in water stored in soils. D) a decrease in the number of days with freezing temperatures.
The aerated zone ________.
a.) is a well-oxygenated, shallow aquifer b.) lies below the capillary fringe zone c.) pore spaces are filled with water d.) lies above the water table
In the 1967 and 1973 Arab-Israeli wars, Soviet-backed Syrian forces fought U.S.-backed Israeli troops. American support of Israel in this war prompted Arab members of OPEC to impose an ________ __________, refusing to sell their oil to the United States
Fill in the blank(s) with correct word
Most of the agricultural productivity of the United States and Canada is concentrated in which two physiographic regions?
A) Coastal Ranges and Intermontane Basin and Plateau B) Coastal Ranges and Great Plains C) Gulf-Atlantic Coastal Plain and Great Plains D) Interior Highlands and Interior Lowlands E) Interior Lowlands and Great Plains