Which of the following statements describes the atmospheric condition when the sky begins to turn milky white?
A. Small particles such as dust and salt become suspended in the air.
B. The daytime temperature is oppressively hot.
C. The relative humidity decreases below about 10 percent.
D. The concentration of ozone begins to reach dangerous levels.
Answer: A
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Which of the following statements describes why particulates with a diameter of less than 2.5 micrometres are particularly dangerous?
A. They are chemically neutralized by dissolved carbon dioxide. B. They absorb ultraviolet radiations effectively. C. They dissolve easily in water. D. They can penetrate deep into the lungs.
The most important source of income to many Native American groups is
A. agriculture B. manufacturing C. cultural tourism D. gambling casinos
What process involves the clumping of small particles into larger masses?
a. Condensation b. Coagulation c. Secretion d. Accretion
Instructions: Choose one answer from each pair of selections. Halos are sometimes observed in thin, sheetlike, high clouds, composed of WATER | ICE particles