Question

read the passage and look at the picture.
the andean volcanic belt spans the west coast of south america. this volcanic belt began to form when the nazca plate moved toward and subducted, or sank, below the south american plate.
nineteen of the volcanoes in the andean volcanic zone are in colombia. some of these volcanoes, such as the nevado del ruiz volcano, are covered with ice and snow. when nevado del ruiz erupts, the lava melts the ice and snow. this process can form a dangerous mudslide called a lahar.
complete the sentence.
the andean volcanic belt formed at a ______ boundary.
convergent
divergent
transform

Explanation:

The passage states the Nazca Plate moved toward and subducted below the South American Plate. Subduction occurs when two tectonic plates collide, which defines a convergent boundary. Divergent boundaries involve plates moving apart, and transform boundaries involve plates sliding past each other, neither of which match the described formation process.

Answer:

convergent