Summary:
- Converging plates can be oceanic, continental, or one of each.
- A subducting plate creates volcanoes.
- Many of the world's volcanoes are the result of subduction at a convergent plate boundary.
- Melting at divergent plate boundaries is due to release of pressure.
- Lava erupts through long cracks in the ground, or fissures.
- Seafloor spreading creates new seafloor in the rift valleys.
- Rifting in a continent can create a new ocean eventually.