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Rock and Mineral Dictionary |
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 water cycle The water cycle (also known as the hydrologic cycle) is the journey water takes as it circulates from the Earth to the sky and back again. |
 watermelon tourmaline Watermelon tourmaline is a tourmaline gemstone that is multicolored, going from pink to green. The Schreiner pin above is made of paste (glass) watermelon tourmaline. |
"water sapphire" "Water sapphire" is not a true sapphire, but is iolite, a more common, softer, and much less expensive mineral. It is a transparent, violet-blue, light blue, or yellow-gray mineral. Iolite is pleochroic; a single stone will show many colors (in the case of Iolite, violet-blue, light blue, and yellow-gray). Iolite has a hardness of 7 - 7.5. Iolite is found in Sri Lanka, India, Madagascar and Burma. |
wairakites Wairakite (hydrated calcium aluminosilicate) is a colorless, feldspathoid mineral originally found in hot-springs in Wairakei, New Zealand, and Onikobe, Japan. |
 wave Most waves are caused by the wind. |
  Wegener, Alfred L. Alfred Lothar Wegener (1880-1930), the German geologist and meteorologist, proposed the theory of continental drift in his 1915 book, On the Origin of Continents and Oceans. This theory states that parts of the Earth's crust slowly drift atop a liquid core. The fossil record overwhelmingly supports and gives credence to the theory of continental drift (and that of plate tectonics). He proposed the existence of the supercontinent Pangaea, and named it (Pangaea means "all the land" in Greek). Wegener froze to death while heading an expedition crossing the Greenland ice cap in 1930. |
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Rock and Mineral Dictionary |
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