Which process explains volcanic arc formation along the western edge of South America?

💡 Explanation

When the Nazca plate subducts under the South American plate, flux melting occurs because water is released from the subducting slab, lowering the melting point of the mantle wedge, allowing magma to rise and form volcanoes. Therefore subduction and partial melting results, rather than plume upwelling, rifting, or transform fault movement which require different tectonic settings.

• Which surface change develops because localized airflow consistently removes fine sediment?
• Which phenomenon causes offset stream channels along transform plate boundaries?
• Which climatic consequence occurs when a major volcanic eruption disrupts the North Atlantic subpolar gyre?
• Following months of increased stress, which outcome primarily results during stick-slip behavior along fault lines?
• Which outcome occurs along prevailing wind pathways when vegetation removal destabilizes dune systems?
• Which effect results when wind interacts with Earth's rotation near a deep ocean surface current?