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plate interactions challenge
case 3: south america
the nazca plate and the south american plate meet along the western edge of south america. get the facts in the case and decide what is happening at the plate boundary.
get the facts
courtesy nasa goddard space flight center

Explanation:

To determine what is happening at the boundary between the Nazca Plate and the South American Plate, we can recall plate tectonics concepts:

1. Identify Plate Types: The Nazca Plate is an oceanic plate, and the South American Plate is a continental plate.
2. Plate Boundary Type: When an oceanic plate (denser) converges with a continental plate (less dense), the oceanic plate subducts (dives) beneath the continental plate. This is a convergent plate boundary (specifically, an ocean - continental convergent boundary).
3. Geological Features: Such a boundary leads to the formation of features like oceanic trenches (off the coast, where the subduction occurs) and continental mountain ranges (like the Andes Mountains in South America, formed by the compression and uplift from subduction). Also, volcanic activity and earthquakes are common here due to the subduction process (the subducting plate melts, forming magma that rises, and the friction/collision causes earthquakes).

If we were to analyze after clicking "Get the Facts", we would confirm:

• The Nazca Plate (oceanic) subducts under the South American Plate (continental) at a convergent boundary.
• This process creates the Andes Mountains, the Peru - Chile Trench, and is associated with volcanic eruptions (e.g., in the Andes volcanic arc) and frequent earthquakes in the region.

So, the key process at this plate boundary is ocean - continental convergence with subduction of the Nazca Plate beneath the South American Plate, leading to mountain building, volcanic activity, and earthquakes.

Answer:

To determine what is happening at the boundary between the Nazca Plate and the South American Plate, we can recall plate tectonics concepts:

1. Identify Plate Types: The Nazca Plate is an oceanic plate, and the South American Plate is a continental plate.
2. Plate Boundary Type: When an oceanic plate (denser) converges with a continental plate (less dense), the oceanic plate subducts (dives) beneath the continental plate. This is a convergent plate boundary (specifically, an ocean - continental convergent boundary).
3. Geological Features: Such a boundary leads to the formation of features like oceanic trenches (off the coast, where the subduction occurs) and continental mountain ranges (like the Andes Mountains in South America, formed by the compression and uplift from subduction). Also, volcanic activity and earthquakes are common here due to the subduction process (the subducting plate melts, forming magma that rises, and the friction/collision causes earthquakes).

If we were to analyze after clicking "Get the Facts", we would confirm:

• The Nazca Plate (oceanic) subducts under the South American Plate (continental) at a convergent boundary.
• This process creates the Andes Mountains, the Peru - Chile Trench, and is associated with volcanic eruptions (e.g., in the Andes volcanic arc) and frequent earthquakes in the region.

So, the key process at this plate boundary is ocean - continental convergence with subduction of the Nazca Plate beneath the South American Plate, leading to mountain building, volcanic activity, and earthquakes.