The surface of a flow has formed a small piece of crust. (Photo: Tom Pfeiffer)
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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.
Nyamuragira volcano photos
: Africa's version of Mauna Loa, Nyamuragira (or Nyamulagira) is a massive basaltic shield volcano neighboring Nyiragongo. It is one of the most active volcanoes in the world and has voluminous eruptions every few years.