What Is a Solarium?
What Is a Solarium? A solarium may be a sundial. It may also be a terrace, a balcony or a room exposed to the rays of the sun, especially on
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Sunlight
Why Does Skin Color Vary?
Why Does Skin Color Vary? People vary in the color of their skin because of a network of pigment-forming cells called melancoytes. This netw
What Is Photosynthesis?
What Is Photosynthesis? Photosynthesis is the process by which green plants make food for themselves-and, indirectly, for all animals, inclu
Why Is Grass Green?
Why Is Grass Green? The green color in grass-and in most other plants-comes from chloroplast within the cells, each of which contains four d
Why Does Paper Turn Yellow with Age?
Why Does Paper Turn Yellow with Age? Oxidation causes paper to turn yellow with age. Most paper is made of plant fibers that have been bleac