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12 years ago
Why do volcanic mountain chains, such as the Andes, accompany deep trenches like the Nasca Trench off South America? 
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12 years ago
When plate tectonics causes a denser oceanic plate beneath a moving continent, the basalt sinks down into a deep trench, but the heat of subduction causes molten magma to rise up under the edge of the continent, creating volcanoes. 
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