Erta Ale volcano's lava lake back in Nov 2009. The red glow of the lava illuminates the crater walls under the blue sky of dusk. A small group of observers is on the left crater rim. During the past 7 years, the lava lake has gradually risen. As of now (Dec 2016), the lava lake has completely filled the pit crater and constructed a new shield by ongoing overflows. (Photo: Tom Pfeiffer)
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.
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