p361 # 14 - 20
14. CO2 and water vapor are greenhouse gases.
15.
a. Burning gas and coal, photosynthesis, and burning fossil fuel.
b. Refining fossil fuels, raising livestock, riding animal wastes
16.
a. For it to be hotter, there would need to be more greenhouse gases on earth
b. For it to be cooler, there would need to be less greenhouse gases on earth
17. Glass is much warmer because in allows the heat in, but once in they are trapped which leads to the temperature rising.
18. (on paper)
19. natural gases, CO2, calcium carbonate
20. Carbons can because they have human as well as plant activity.
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