Question

plate interactions challenge
your score: 5
time:
case 3: south america
what geological event is most likely to occur at this plate boundary in the future?
a chain of volcanic islands will form off the south american coast.
part of the south american continent will break off, forming a new sea.
new crust will be formed by magma oozing up between divergent plates.
eruptions will occur at volcanoes such as cotopaxi.
courtesy nasa goddard space flight center

Explanation:

The South American west coast has a convergent plate boundary (Nazca Plate subducting under South American Plate), leading to volcanic activity (like Cotopaxi). The other options: volcanic island chains form at ocean - ocean convergent or hotspots, not here; continental rifting (forming new sea) is for divergent boundaries (not South America's west coast); new crust at divergent (mid - ocean ridges), not here. So eruptions at volcanoes like Cotopaxi are most likely.

Answer:

Eruptions will occur at volcanoes such as Cotopaxi.