Download A Grain of Sand: Nature's Secret Wonder by Gary Greenberg PDF

By Gary Greenberg

Here's the realm seen inside of a grain of sand, because of the lovely three-d microphotography of Dr. Gary Greenberg. to a couple, all sand appears alike--countless grains in an unlimited expanse of seashore. glance closer--much closer--and your view of sand shouldn't be a similar. applying the glorious microphotographic concepts that he constructed, Greenberg invitations readers to find the unusual and lovely international that every grain of sand comprises.

Here are the sands of Hawaii and Tahiti, the Sahara and the Poles, a volcano, each one exquisitely diverse, and every telling a desirable geological tale. crimson sand and yellow, white sand and black, making a song sand and quicksand: Greenbergs images display the sophisticated alterations of their colours, textures, sizes, and shapes. And as this infinitesimal global unfolds so does an exciting clarification of the way every one grain of sand starts and kinds and unearths itself in a selected position, certainly one of a thousand million and different.

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Additional resources for A Grain of Sand: Nature's Secret Wonder

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If you examine a thin slice of rock under the microscope using crossed polarizing filters, you can clearly make our the grain boundaries between the various crystals and minerals. As the rock weathers, the grains work loose and wash away as sand. The shape of each grain of sand holds a clue to its history. For example, the degree of roundness is an index of its age. All sand grains that are formed by weathering of rock start out angular and become more rounded as they are polished by abrasion from wind, water, ice, and tumbling.

The tips have broken off and been deposited as grains of sand on a Maui beach (magnification SOx). Middle: A fragment of a sea urchin spine shows its intricate internal design in side view in sand from Maui (magnification SOx). Right: Sand grains in the form of glasslike needles are actually microscopic sponge spicules, the internal skeletons of sponges. The spicules surround the tip of a spiral shell that has broken off and eroded into a beautiful, translucent grain of sand (magnification 70x) .

Sand grains from this region of the globe illustrate the sheer beauty of the tiny bits and pieces that form our world. Some sand contains a large amount of silica, a mineral that occurs as quartz. If the sand contains a high percentage of silica, it can be used to make glass. Hundreds of millions of years ago, regions like Sedona, Arizona, and the neighboring Grand Canyon were an underwater seabed. Layer after layer, the sandy bottom was compressed by overlying sediment. Then the terrain rose up from the seabed by tectonic forces, and the strata hardened into sandstone.

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