Convergent Plate Boundary
When two tectonic plates move towards each other it´s called a convergent plate boundary (a subduction zone). The heavier oceanic plate will eventually sink under the lighter Continental plate. The Andes mountain chain is an example where a heavy oceanic plate (Nazca Plate) is subdued below a lighter continental plate (South American plate). Lookup Plate Tectonics.
Picture Source: https://arstechnica.com/science/2015/04/magma-beneath-the-cascade-volcanoes-might-be-special-blend/
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