Chlorofluorocarbons
A) have decreased in concentration in the atmosphere since the implementation of the Montreal Protocol.
B) are a common component of volcanic gases.
C) cause increased levels of harmful ozone in the stratosphere.
D) typically stay in the atmosphere for approximately six months.
E) are naturally occurring compounds.
A
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Write a short paragraph distinguishing between conduction and convection. Give two examples of each
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Comparing the characteristics of two minerals, a student stated, "These two minerals are identical because they are both transparent and are six sided." Critique this statement
A) This statement is true. B) This statement is probably true, but the chemical composition would need to be known. C) There are different types of six-sided crystals, so there is not enough information to say they are identical. D) This statement is false.
Volcanic island arcs and continental volcanic arcs are both associated with convergent plate boundaries. However, the lavas that their volcanoes erupt are different. Where does the lava come from for each type of volcanic arc?
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Pastoral nomads
A) are expanding their territory in North Africa and the Middle East. B) occupy only their own territory, moving with the seasons to find forage and water. C) occupy different territory each year to find forage and water. D) consume mostly meat, rather than grain. E) prefer sheep to goats because sheep require less water and will forage on virtually any vegetation.