Crater Basalt is a volcanic field of 9 cinder cones in the northern Patagonia region of southern Argentina 130 km SE of San Carlos de Bariloche.
The volcanic field covers an area of 700 sq km, and consists of cinder and spatter cones with many overlapping blocky basalt lava flows.
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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