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A pyroclastic density current or flow is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph). The gas can reach temperatures of about 1,000 °C (1,830 °F). Pyroclastic flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the volcanic output rate, and the gradient of the slope.

50 fotos HD Impresionantes de StumbleUpon....

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Lisa Elmaleh, collodion prints of the Everglades, via www.landscapestories.net

Lisa Elmaleh, collodion prints of the Everglades, via www.landscapestories.net

Joshua Dudley Greer  Parkton, Maryland, 2005   From the Somewhere Along the Line series

Joshua Dudley Greer Parkton, Maryland, 2005 From the Somewhere Along the Line series

The contemplative and intimate landscapes of British photographer Brian David Stevens via WayneFord's Posterous

The contemplative and intimate landscapes of British photographer Brian David Stevens via WayneFord's Posterous

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