The transfer of heat from one material to another through direct contact is known as:
A convection.
B conduction.
C evaporation.
D radiation.
Answer: B conduction.
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The high concentration of iridium at the Cretaceous Tertiary boundary may be attributable to
A. an out flux of iridium from Earth's interior. B. meteorite bombardment. C. a worldwide rise in sea level. D. none of the above
Ultimately, positive and negative feedbacks on Daisy World lead to a system that perpetuates
A) further positive feedbacks. B) further negative feedbacks. C) a system that stays within certain limits. D) a system exceeding positive or negative feedback limits.
In the late 1970s, the United States banned the non-essential use of chlorofluorocarbons (CFCs). Why?
A) CFCs are a primary component of photochemical smog. B) CFCs are toxic gases. C) CFCs reduce the ozone concentration in the stratosphere. D) CFCs react with water vapor to form acid rain.
Unlike the United States, Canada has experienced considerable emigration, or out-migration, most often to Europe
Indicate whether the statement is true or false