11. Which of the following is a secondary pollutant
12. The supersonic jets cause pollution by the thinning of
13. Scientists are able to determine the air temperature in the thermosphere by:
14. What is "Black Lung"?
15. A permeable rock that contains hydrocarbon fluids and gases is called a/an
16. In an oil trap formed by an anticline, __________ accumulates on top, __________ in the middle, and __________ at the bottom.
17. Macroconsumers include
18. Thermal belts are usually found
19. The term "normal" refers to weather data averaged over:
20. At any given time, ______ of the earth is illuminated by the sun.
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