The precise time of the onset of El Niño varies, but averages every ________ years
A) 100
B) 50-60
C) 30-40
D) 20-30
E) 2-7
Answer: E
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Which occurrence will produce upwelling near coasts?
A) ?wind blowing toward the north along the West Coast of North America B) ?wind blowing toward the south along the West Coast of North America C) ?wind blowing toward the south along the East Coast of North America D) ?wind blowing toward the north along the East Coast of South America
The primary aim of the Endangered Species Act is to ____.
A. set standards for pollution levels B. require screening of new products for safety and setting standards C. encourage resource conservation D. set aside or protect certain species, resources, and ecosystems E. require evaluation of the environmental impact of an activity proposed by a federal agency
Around 1900, about what percentage of people in North America lived on farms?
A) 10% B) 30% C) 50% D) 70%
The fact that older fossils are more unlike living organisms implies that old forms of life died out and that new forms of life have developed is known as ________.
A. law of superposition B. law of faunal succession C. law of original horizontality D. law of inclusions