Download e-book for kindle: A Grain of Sand: Nature's Secret Wonder by Dr. Gary Greenberg, Stacy Keach

By Dr. Gary Greenberg, Stacy Keach

ISBN-10: 0760331987

ISBN-13: 9780760331989

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. crimson sand and yellow, white sand and black, making a song sand and quicksand: Greenbergs images demonstrate the sophisticated modifications of their shades, textures, sizes, and shapes. And as this infinitesimal international unfolds so does an exciting clarification of the way every one grain of sand starts and varieties and unearths itself in a specific position, one in all one billion and unique. 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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Extra info for A Grain of Sand: Nature's Secret Wonder

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To make the background black, I put the sand on a glass slide. Highly oblique reflected light is produced by two large fiber-optic light sources built into the microscope. The lighting angle creates dramatic highlights and shadows. Since there is a dark empty space below the glass slide, it appears as though the sand is floating on a black background. Most of the images in this book were created in the following way: First, I neatly spread out each sample of sand on a glass slide, and then I take a microscopic journey of one square inch of sand, grain by grain.

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. Metallic minerals, however, do have a definite color. Oftentimes, the brown or reddish hue of sand grains is due to the presence of iron oxide. Many desert sand grains, including those in the northern Sahara, are coated with a thin layer of iron oxide that precipitates from the atmosphere.

Interestingly enough, some animals, such as bees and migratory birds, see polarized light naturally. They use this special sense to navigate from place to place, even during overcast days when the sun isn't out. In fact, it has recently been shown that migratory songbirds use polarized light to recalibrate their internal magnetic compass at sunrise and sunset. Sand from Skeleton Beach in Namibia contains rounded and polished pink-and-red garnet and angular black magnetite (magnification 170x). 60 The Colors of Mineral Sand A quartz sand grain seen through crossed polarizing filters shows rainbow birefringence.

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


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