A Grain of Sand: Nature's Secret Wonder by Dr. Gary Greenberg, Stacy Keach

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By Dr. Gary Greenberg, Stacy Keach

Потрясающие трёхмерные микрофотографии песчинок обычного пляжного песка. listed below are the sands of Hawaii and Tahiti, the Sahara and the Poles, a volcano, every one exquisitely diversified, and every telling a desirable geological tale. pink sand and yellow, white sand and black, making a song sand and quicksand: Greenbergs photos exhibit the sophisticated variations of their colours, textures, sizes, and shapes. And as this infinitesimal global unfolds so does an interesting rationalization of the way every one grain of sand starts and varieties and reveals itself in a selected position, one among a thousand million and different. Вот тот мир, рассматривать в песчинку, благодаря потрясающей трехмерной микрофотографии доктор Гари Гринберг. В какой-то, весь песок выглядит так - бесчисленное зерен в обширном пространстве пляжа. Присмотритесь - гораздо ближе - и ваш взгляд на песке никогда не будет то же самое. Используя фантастические microphotographic методы, которые он разработал, Гринберг приглашает читателей поймет странный и прекрасный мир, что каждая песчинка содержит. Вот песках Гавайев и Таити, Сахары и поляки, вулкан, изысканно каждого разные, и каждая рассказывает увлекательную геологической истории. Красный и желтый песок, белый песок и черный, пение песка и зыбучие пески: Greenbergs фотографий выявить тонкие различия в их цвета, фактур, размеров и форм. И так как это бесконечно малая мире разворачивается так же интригующий объяснение того, как каждая песчинка начинается и форм и оказывается в определенном месте, одна из миллиардов и единственный в своем роде.

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The most common animals in this zone are sand fleas and crabs, which take refuge under driftwood and seaweed during the day. Both are crustaceans that consume dead plant and animal material. Sand dunes create an interesting ecological environment. Frontal dunes closest to the water often host a plant and animal community. The specialized plants have adaptations such as waxy coverings on the leaves, small leaves with few stomata, large root systems, and thick stems and leaves to store water. The first line of dunes is the primary dune, which deflects ocean breezes and creates a semiprotected environment on the backside of the dune.

The coral produces an exoskeleton of calcium carbonate, which forms around the base of each polyp, allowing them to retreat inside for protection. The vibrant color of coral is due to the presence of algae called zooxanthellae. Different species of zooxanthellae give the coral different colors. The algae provide the coral with energy through photosynthesis and aid in calcification of the reef. In return, the coral provides the zooxanthellae a safe environment in which to flourish. This is an excellent example of a symbiotic relationship, where two different species live together for the purpose of mutual benefit.

60 The Colors of Mineral Sand A quartz sand grain seen through crossed polarizing filters shows rainbow birefringence. The colors indicate the extent to which the crystal has rotated the plane of the polarized light (magnification 160x). Vibrant color is a stunning phenomenon in minerals, but mineralogists tend not to rely very much on color as an identifying characteristic. Some minerals, like garnets, come in many colors due to changes in composition or the presence of impurities. Garnets can be blood red, pale pink, brown, black, green, or orange depending on their chemistry.

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