When I look out the window, I see a lot of green. That's because there are a lot of plants.
Why is chlorophyll green?
The answer: green plants are green because they contain a pigment called chlorophyll. Chlorophyll appears green to our eyes because most of the light it absorbs is blue and red, leaving behind the rest of the spectrum, which averages out to green.
Why is the sky green before a tornado?
One theory that 'holds water', so to speak, is that certain thunderheads filter wavelengths of light, leaving only green. Computer models verify the thickness of the cloud combined with the diameter of the water droplets can produce a green color. A powerful thunderstorm has the right size of clouds, optimal amount of water, and may produce a tornado.
Why is water green?
Green water lakes commonly have high concentrations of chlorophyll-containing algae which can give water a green color. Chlorophyll can be measured with sensors such as the YSI chlorophyll probe. Green lakes are often eutrophic and typically contain more harmful algal blooms than other types of lakes.
Why are frogs green?
Frogs are not green because they have green pigment in their skin. Instead, they use a complex arrangement of cells, a more complicated approach to be sure, but one that provides a tremendous potential for changing and adjusting their hue. In their skins they have three types of pigment cells (called chromatophores) stacked on top of each other. At the bottom are melanophores, containing a mostly dark pigment called melanin. These are the same cells that can make human skin various shades of brown. On top of the melanophores are iridophores, packed with highly reflective bundles of purine crystals, and on top of the iridophores are xanthophores, usually packed with yellowish pteridine pigments. In the typical green frog, light penetrates to the iridophores, which act like tiny mirrors to reflect mostly blue light back into the xanthophores above them. These cells act like yellow filters, so the light escaping the skin surface appears green to our eyes. Occasionally a frog is found that lacks the yellow xanthophore cells, and these are hard to miss because they are bright blue!
Our first picture is the Houtby farm yesterday. This is not a happy crop picture. There's been a heat wave and the peonies are blooming. This is a crop that is picked in bud, so these are a pretty show, but not a happy moment. Our next picture is another view of the iris garden at RBG.
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