GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Ancient volcanic eruption. Artwork of volcanoes in Edinburgh during the Carboniferous period, 340 million years ago. The Holyrood Park area of modern Edinburgh contains the remains of extinct volcanoes from this period. The bulk of the Arthur's Seat (or Lion's Head) peak is formed from a plug of solidified lava from inside the volcano depicted erupting here. At the time, the area that is now Europe formed part of a larger continent at the Equator, and was covered with shallow seas.
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