1. Volcanoes: When plates collide, one plate can be forced beneath the other (subduction). This process melts the descending plate, creating magma. The magma rises to the surface, erupting as volcanoes. These volcanoes are often found along the edges of continents or in the ocean basins.
2. Earthquakes: Plate movement can cause earthquakes, which are sudden releases of energy along fault lines. These faults are fractures in the Earth's crust where plates are sliding past each other. The movement along these faults can be slow and gradual, or it can be sudden and violent, causing seismic waves that shake the ground.