Although rocks are common, few of us take the time to consider how amazing they are. Forged in volcanoes or moulded by millennia of pressure, these solid masses of minerals hold the key to understanding how our planet formed. Rocks can also contain fossils, the remnants of long-extinct organisms, which give scientists clues about what creatures and plants have lived on Earth during its 4.5-billion-year history.
Moeraki Boulders, South Island, New Zealand
Today in History
More Desktop Wallpapers:
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Heri es-Swani in Meknes, Morocco
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Road to Hana, Maui, Hawaii, USA
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A kingfisher perched on a branch
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Marine iguanas, Galápagos Islands, Ecuador
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Coyote Gulch, Glen Canyon National Recreation Area, Utah, USA
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Constitución railway station, Buenos Aires, Argentina
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Japanese tree frog in a pink morning glory
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Alam-Pedja Nature Reserve in Tartu County, Estonia
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Boreal owl
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Santa Claus Village in Rovaniemi, Lapland, Finland
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Barrier reef off Grande Terre, New Caledonia, France
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Red mangrove in the Pig Keys, Honduras
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Emerald Lake, Yukon, Canada
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Camels, Rajasthan, India
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Merced River, Yosemite National Park, California, United States
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Samuel Beckett Bridge, Dublin, Ireland
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Koala, Australia
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Marsala salt pans, Italy
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Shi Shi Beach in Olympic National Park, Washington, USA
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Champaka Sarasi, Shivamogga, Karnataka, India
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Inside the Nobel Peace Centre, Oslo, Norway
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Peña Falcon rock, Monfragüe National Park, Spain
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Jeju Island, South Korea
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Beach chairs on Steinwarder in Heiligenhafen, Germany
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Vasco da Gama Bridge, Lisbon
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Ceiling of the Temple of Esna, Egypt
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Field of blue agave near Tequila, Jalisco, Mexico
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Prosecco Hills, Veneto, Italy
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Sea otter, Alaska, USA
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Telašćica Nature Park, Dugi Otok, Croatia
Bing Wallpaper Gallery

