Earthwatcher

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Posted: 19 Sep 2008


Taken: 12 Sep 2008

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1/40 f/4.5 17.0 mm ISO 100


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Keywords

rocks
geo:lat=52.03068
pillow lava
Strumble Head
Ordovician
Pembrokeshire
Wales
polariser
geology
basalt
coast
geotagged
geo:lon=-5.068501


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Pillow lavas on Strumble Head, Pembrokeshire

Pillow lavas on Strumble Head, Pembrokeshire
This is a view of the Ordovician age pillow lavas on Strumble Head, Pembrokeshire.
Pillow lavas are formed when molten basalt lava is erupted onto the sea floor. If the water is deep enough, the hydrostatic pressure stops the lava from exploding the sea water into steam. Instead, the liquid rock and liquid water co-exist together in an uneasy truce. The lava is extruded like toothpaste into successive oval globules, resembling pillows or sacks, hence the name. See the video clip here:

oceanexplorer.noaa.gov/explorations/04fire/background/vol...

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