Why did the oceanic Crust subducted

There’s no picture or character?

Answer any resource, such as wood or solar energy, that can or will be replenished naturally in the course of time;

The second one. this is because the crust is thin, while the mantle is the thickest layer. also, the core is the highest in temperature because of all the pressure from the other layers, so it's solid iron and nickel.

Is this science or geogrpahy ? ? a little confused