Regions where air masses originate are known as ____________________
Fill in the blank with correct word.
ANSWER: source regions?
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Electric charge flows in an electric circuit when
A. the circuit is grounded. B. electric resistance is low. C. a potential difference exists. D. electric devices in the circuit are not defective.
Using blood tests and statistical sampling, medical researchers at New York City's Mount Sinai School of Medicine found that it is likely that nearly every person on the earth has detectable levels of ____ in their bodies.
A. hazardous chemicals B. carcinogens C. petrochemicals D. DDT E. persistent organic pollutants (POPs)
Temperatures on Earth would be lower if there were less carbon dioxide in the atmosphere.
Answer the following statement true (T) or false (F)
Which of the following is the most abundant natural greenhouse gas?
A) oxygen B) nitrogen C) carbon dioxide D) methane E) water vapor