Are you ready to make some noise? It"s International Rock Day! Wait, not that sort of rock. On this day, we"re all about granite, limestone and slate. There are three types of rock: igneous are formed from solidified magma and lava; sedimentary rocks are layers of sedimentary particles such as sand; and metamorphic rocks are the result of heat and pressure on other kinds of rock.
International Rock Day
Today in History
More Desktop Wallpapers:
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Stripes in sight
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Cinque Torri, Dolomites, Italy
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Where are these illuminated walkways?
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Alps of the sea
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Daintree Rainforest and Noah Beach, Queensland, Australia
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Happy Halloween!
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World Whale Day
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Happy Canada Day!
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Muir Woods National Monument, California, United States
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Beech trees and anemone wildflowers, Jutland, Denmark
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Walruses in Svalbard, Norway
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Amber waves of grain
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Striated heron on a Victoria water lily, Pantanal, Brazil
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What waterborne wizardry is this?
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Koala in the Great Otway National Park, Australia
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Sunrise at Grand Teton National Park, Wyoming, USA
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Keel-billed toucan, Costa Rica
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Italica, an old Roman city in Santiponce, Andalusia, Spain
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Fossils of belemnites and ammonites, Jurassic Coast, UK
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Thorrablot: The Icelandic midwinter festival
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Castle Stalker, Argyll, Scotland
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Grand Staircase-Escalante National Monument, Utah
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Skipper butterfly on an Echinacea flower
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Marie Lake, John Muir Wilderness near Bishop, California, USA
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Saving and celebrating honey bees
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Trevi Fountain, Rome, Italy
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Tombeau du Géant in Bouillon, Belgium
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Shi Shi Beach, Olympic National Park, Washington, United States
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Tower Bridge, London, England
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An experiment in sustainability
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