Old crust is recycled by subduction
At an oceanic-oceanic convergent boundary, old crust is recycled by subduction new crust is created
Explanation:
At convergent boundary, the denser plate is subducted underneath the less dense plate. The subducted plate therefore dives into the mantle where it melts to molten rock to due the high pressure and temperature in the layer. This crust, therefore, gets recycled in the mantle. As old crust is being consumed at convergent boundary, new crust is being formed at a divergent boundary where tectonic plates are moving away from each other. This maintains a homeostatic balance with steady recycling of old crust into new crust
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