What is the current population of the Earth?
A) over 7 million
B) 670 million
C) nearly 2 billion
D) over 7 billion
E) nearly 2 trillion
D
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What are some of the useful products humans obtain from volcanoes? What will be an ideal response?
Which of the following is not a greenhouse gas?
A. carbon dioxide B. methane C. water vapor D. nitrous oxide E. stratospheric ozone
An organism such as a fish whose body temperature is nearly the same as the environment is referred to as ________
A) homeothermic B) warm-blooded C) poikilothermic D) endothermic
During the spring, on a warm, sunny day in Boston, Massachusetts, the wind shifts from southwesterly to northeasterly and the weather turns cold, damp, and overcast. This suggests that a “back door” cold front approached Boston from the
a. southeast b. southwest c. northeast d. west e. northwest