Question

1. which process is responsible for the recycling of earths crust?

transform faulting
seafloor spreading
subduction
mountain building

Explanation:

Subduction is the process where one tectonic plate moves under another and is recycled back into the Earth's mantle. It is responsible for recycling Earth's crust. Transform faulting is about horizontal movement of plates, seafloor - spreading creates new crust, and mountain - building is mainly about crustal uplift.

Answer:

Subduction