Are you ready to make some noise? It"s International Rock Day! Wait, not that sort of rock. Today, 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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Sand dunes in the Sahara, Algeria
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Solo on the savanna
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A mile-high island
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Merry Christmas!
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When only a hug will do
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Skiddaw, Lake District National Park
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Füzér Castle in the Zemplén Mountains, Hungary
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Burns Night
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Night outside the museum
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Ring of fire solar eclipse
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Call of the wilderness
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In a world of their own
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Christmas Eve
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Yungang Grottoes, Datong, China
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San Gimignano, Siena, Italy
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Grand National
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Stealthy pollinators
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Alpine Lakes Wilderness, Washington, USA
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Big Bends birthday bash
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Beautiful Borovets
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A bevy of buzzers
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Spine-cheeked anemonefish
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Launching hopes and prayers
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City Hall, London, England
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World Octopus Day
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Whitehaven Beach, Whitsunday Islands, Australia
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Sanctuary among the trees
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Sequoias of the sea
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Tasmans Arch, Tasman National Park, Tasmania, Australia
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Rio Negro
Bing Wallpaper Gallery

