What evidence supports the hypothesis that most of the dust that contributes to hazy summer skies in the southeastern United States originates in Africa?
What will be an ideal response?
a) Satellite images show dust storms blowing dust from Africa across the Atlantic Ocean. Observed hazy conditions in the Caribbean coincide with these storms.
b) Measurements of variation in dust concentrations over a period of days in the U.S. show that the dust enters the U.S. from the south and southeast (from the Caribbean area).
c) The summer dust in the southeastern U.S. has high concentrations of aluminum and iron, consistent with minerals that compose the dust in the Sahara.
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Resilience
What will be an ideal response?
If you eat metallic sodium or inhale chlorine gas, you stand a strong chance of dying. Let these two elements react with each other, however, and you can safely sprinkle the compound on your popcorn for better taste. What is going on?
A. Sodium chloride has nothing in common with sodium and chlorine. B. All elements are inherently dangerous. C. Sodium and chlorine from the elemental form is more concentrated than the sodium and chlorine we get from sodium chloride. D. After these two elements react, they lose the potential energy to cause harm.
An animal import that has been a particular pest in Australia is the
A. domestic cat B. rabbit C. mouse D. horse
On the accompanying map, volcanic eruptions are most likely at locations
A. 2 and 5. B. 2 and 3. C. 1 and 3. D. 1 and 2. E. 3 and 4.