1. Human exposure to ultraviolet radiation such as UV-C can cause skin cell damage and skin cancer while UV-B and UV-A cause sunburns. Infrared radiation is mostly heat energy and has no direct harm to human life.
2. Visible solar radiation kickstarts photosynthesis by energizing chlorophyll molecules and also create double bonds of certain molecules within your eyes, enabling human sight.
3. Dry areas such as New Mexico and Arizona have wider air-temperature fluctuations from night to day because the air is less dense and hold less water vapor causing less greenhouse gas and less absorption of heat rather than the trapping of infrared radiation which occurs in humid areas such as in Florida, where the humidity and dense atmosphere holds on to the heat and causes less fluctuation from day to night.
4. a) Daytime temperatures would be much colder because the air would be less dense and would not expand and have as much energy as when it is heated, infrared heat would not be reradiated as much and the earth's surface would be cooler.
b) Nights would also be cooler; however, even cooler than the daytime because in the day visible light and UV radiation could warm you up but without the sun it would get very cold in a less dense atmosphere.
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