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 varied, and every telling a desirable geological tale. purple sand and yellow, white sand and black, making a song sand and quicksand: Greenbergs images exhibit the delicate alterations of their colours, textures, sizes, and shapes. And as this infinitesimal global unfolds so does an fascinating rationalization of the way each one grain of sand starts off and varieties and unearths itself in a selected position, considered one of one billion and one-of-a-kind. 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 sand is usually very dry, with less than 1 percent wetness. Also the sand must have a medium grain size and be well sorted for consistent size, so that all the grains have about the same diameter. The grains are quite spherical in shape with semipolished or frosted surfaces when viewed through a low-power microscope. However, unevenness in surface roughness on the electron microscope level is an important factor for acoustic quality. The pitch of the sound is related to grain size, while the volume of the sound is related to surface texture.
The lifeguard's house, which used to be about 50 meters from the waterline, was almost consumed by the waves. Tree trunks from the previously expansive beach were snapped and the roots laid bare by the raging surf. A year later, a large amount of the sand had returned, but not as much as had been there previously. In Florida, the situation is worse. Storms brewing off the warm Atlantic waters in the summer can turn into hurricanes. They can sweep away miles of Florida beach in a matter of hours.
These little bits of quartz, amethyst, olivine, and garnet catch the light and bounce it around like sparkling jewels. Biological components also sprinkle sand with fabulously bright colors. For example, sea urchin spines and coral can be found in a wonderful range of beautiful colors. Most of the colors seen in the sand grains in this book are natural. But that statement begs the question, what do I mean by "natural"? The colors in this book are natural in that they have not been manipulated or changed.
A Grain of Sand: Nature's Secret Wonder by Dr. Gary Greenberg, Stacy Keach