Question

at which two plate boundaries is old crust being destroyed?
choose 2 answers:
a the cocos and caribbean plate boundary
b the cocos and nazca plate boundary
c the nazca and pacific plate boundary
d the nazca and south american plate boundary

Explanation:

• Convergent boundaries: At convergent boundaries, one plate is forced beneath another (subduction), which destroys old crust.
• Cocos - Caribbean boundary: The Cocos Plate is being subducted beneath the Caribbean Plate. This subduction process destroys the old crust of the Cocos Plate.
• Nazca - South American boundary: The Nazca Plate is subducting beneath the South American Plate. As a result, the old crust of the Nazca Plate is being destroyed.
• Divergent boundaries (e.g., Cocos - Nazca, Nazca - Pacific): At divergent boundaries, new crust is formed (mid - ocean ridges), not old crust destroyed.

Answer:

A. the Cocos and Caribbean plate boundary, D. the Nazca and South American plate boundary