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Lava lake after sunset; the glow of the lava illuminates the crater walls. Observers are visible as tiny silhouettes on the opposite crater rim. (Photo: Tom Pfeiffer)
File: erta_ale_g10944.jpg | 316 Hits Copyright: Tom Pfeiffer / www.volcano-photo.com
The western part of the lava lake is being overturned. The solid crust is broken into large fragments that sink back into the fluid interior of the lake. (Photo: Tom Pfei...
File: erta_ale_i10053.jpg | 5211 Hits Copyright: Tom Pfeiffer / www.volcano-photo.com --- Image found in Erta Ale volcano: November 2009 ... and in: Photo of the Day
The volcano on the evening of 28 Nov 2009. The lava lake is in a phase of crust overturn, and red hot lava illuminates the circular crater walls. (Photo: Tom Pfeiffer)
File: erta_ale_i10001.jpg | 4434 Hits Copyright: Tom Pfeiffer / www.volcano-photo.com --- Image found in Erta Ale volcano: November 2009 ... and in: Photo of the Day
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Introduction to Plate Tectonics The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
Divergent plate boundaries in oceans Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.