Typical examples are poking a hole in the snow and looking down into the hole to see blue light or the blue color associated with the depths of crevasses in glaciers. In each case the blue light is the product of a relatively long travel path through the snow or ice. So the spectral selection is related to absorption, and not reflection as is sometimes thought. In simplest of terms, think of the ice or snow layer as a filter. If it is only a centimeter thick, all the light makes it through, but if it is a meter thick, mostly blue light makes it through. 395 Fact Credit: National Snow and Ice Data Center NSIDC The National Snow and Ice Data Center
Source of Fluoride and Flavonoids. Drinking unsweetened iced tea also helps increase your fluoride intake and provides beneficial flavonoids. An 8-ounce portion of brewed black iced tea contains up to 0.5 milligrams of fluoride, and making your iced tea with fluoridated water can increase your fluoride intake further.
Drinking green tea has also been shown to suppress appetite. While there are several other reasons to drink green tea every day, you may wonder if one cup alone can provide you the benefits. According to well-known nutritionist Priya Kathpal, 4-5 cups of unsweetened green tea in a day is enough to promote weight loss.