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 image credit

Explanation:

Old crust is destroyed at convergent plate boundaries, where one tectonic plate subducts under another.

• A: The Cocos and Caribbean plate boundary is a convergent boundary (Cocos subducts under Caribbean), destroying old crust.
• B: The Cocos and Nazca plate boundary is a divergent boundary, creating new crust, not destroying it.
• C: The Nazca and Pacific plate boundary is a transform boundary, where plates slide past each other with no crust destruction or creation.
• D: The Nazca and South American plate boundary is a convergent boundary (Nazca subducts under South America), destroying old crust.

Answer:

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