The oceanic plate that lies off the Andes is the Nazca Plate. This tectonic plate is located in the eastern Pacific Ocean and is known for its subduction beneath the South American Plate, which is responsible for the formation of the Andes mountain range. The Nazca Plate is one of the fastest-moving tectonic plates on Earth, with an average speed of about 6.6 centimeters per year. This rapid movement is what causes the intense seismic activity in the region, including frequent earthquakes and volcanic eruptions. The subduction of the Nazca Plate beneath the South American Plate is also responsible for the formation of the Peru-Chile Trench, a deep oceanic trench that runs parallel to the Andes. This trench is the result of the Nazca Plate being forced beneath the South American Plate, creating a subduction zone where the two plates meet. The subduction of the Nazca Plate has also led to the formation of the Andean Volcanic Belt, a chain of volcanoes that stretches along the western coast of South America. These volcanoes are a result of the melting of rock and magma as the Nazca Plate is forced beneath the South American Plate. Overall, the Nazca Plate plays a crucial role in the geology and tectonics of the Andes region. Its subduction beneath the South American Plate has not only shaped the landscape of the Andes but also contributes to the seismic activity in the area. For more information on the Nazca Plate and its role in the Andes region, you can visit the website of the United States Geological Survey at www.usgs.gov. They provide detailed information on tectonic plates, subduction zones, and seismic activity around the world. In conclusion, the Nazca Plate is the oceanic plate that lies off the Andes and plays a significant role in the geology and tectonics of the region. Its subduction beneath the South American Plate is responsible for the formation of the Andes mountain range, as well as the seismic activity and volcanic eruptions in the area.

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