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, due to the lovely three-d microphotography of Dr. Gary Greenberg. to a couple, all sand appears alike--countless grains in an enormous expanse of seashore. glance closer--much closer--and your view of sand is just not a similar. applying the wonderful microphotographic options that he built, Greenberg invitations readers to find the unusual and beautiful global that every grain of sand includes.

Here are the sands of Hawaii and Tahiti, the Sahara and the Poles, a volcano, each 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 changes of their shades, textures, sizes, and shapes. And as this infinitesimal international unfolds so does an fascinating clarification of ways every one grain of sand starts off and kinds and unearths itself in a specific position, one among 1000000000 and distinct.

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Diatoms are wonderful examples of worlds within worlds in a grain of sand. The subtidal zone extends from the lowest part of the intertidal zone to as far out in the ocean as sand is moved by wave action. Environmental factors change slowly there, and animals such as eels, flounders, soles, rays, and skates have adapted a burrowing lifestyle. The highest place where the ocean washes onto the beach is called the strand line. This area collects stranded material, which provides a cool, moist environment for small invertebrates like kelp flies, biting fleas, centipedes, beetles, and amphipods.

The intertidal zone is inhabited by a multiplicity of invertebrates and insects such as bivalve mollusks, crustaceans, sea urchins, starfish, sponges, and tubebuilding worms. They have acclimatized to the harsh environment of tide cycles, buffeting waves, high salinity, and predators. When these animals die, they leave behind their skeletons and shells, which are gradually ground into beautiful grains of sand by the action of the surf Some intertidal species burrow into the sand to protect themselves.

Hundreds of millions of years ago, long before the forces of nature gouged away the Grand Canyon, this entire region was situated at the northwestern edge of the United States. It was actually underwater and contained a huge sandy seabed. The oncesandy bottom compressed into sedimentary rock and the land rose up from tectonic forces. Beginning 160 million years ago, these tectonic forces lifted up the 44 The crystal structure of (left) a quartz sand grain from Leisure Bay, South Africa, is still recognizable, whereas that of (right) a quartz grain from Maitland, South Africa, is eroded beyond recognition due to several cycles of cementation and erosion (magnifications 85x).

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