Q. Which of the following are examples of ocean-ocean convergent plate boundary subduction zones?

1. Aleutian zone
2. Philippines zone
3. Mid-Atlantic Ridge zone
4. Juan de Fuca Ridge zone

Select the correct answer using the codes given below:
Answer: Only 1 & 2
Notes: The Aleutian and Philippines zones are ocean-ocean convergent boundaries involving subduction of one oceanic plate beneath another. The Mid-Atlantic Ridge and Juan de Fuca Ridge are divergent plate boundaries associated with seafloor spreading, not subduction. Therefore, only Aleutian and Philippines zones represent ocean-ocean subduction zones among the options given.