Why are some tropical waters unable to sustain life?
A) There is an addition of pollutants in many of these areas.
B) There is a low level of dissolved oxygen due to temperature.
C) There is a greater amount of carbon dioxide.
D) There are more conservative components in these waters.
B
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Which of the following statements about deserts is true?
A) Although rainfalls are infrequent, erosion and deposition related to water are important in deserts. B) Deserts are located where there are ascending air masses and low atmospheric pressure. C) Deserts are defined by their sand content. D) Deserts are always located in hot, humid coastal areas.
Andalusite, kyanite, and sillimanite are described as polymorphs. What does this mean?
A) They have the same atomic structure but different chemical compositions. B) They have the same chemical composition but different atomic structures. C) They all morphed at the same time. D) They are exact opposites of one another.
An increase in a country's physiological density would suggest a(n)
A) increase in the amount of agricultural land. B) limit to the number of farmers. C) increase in the amount of irrigated land. D) increase in the size of its population. E) limit to the number of farm animals.
Oxygen is the most common gas in the atmosphere.
Answer the following statement true (T) or false (F)