1. Volcanoes: Volcanoes are formed when magma from the Earth's mantle rises to the surface, often along divergent plate boundaries where new crust is being created, or convergent boundaries where one plate subducts beneath another.

2. Mountains: Mountains can form along convergent plate boundaries where two plates collide. The immense pressure forces the land upwards, creating mountain ranges. The Himalayas, for example, were formed by the collision of the Indian and Eurasian plates.

3. Deep Ocean Trenches: These are long, narrow depressions in the ocean floor that are formed where one tectonic plate subducts (sinks) beneath another. The Mariana Trench, the deepest point on Earth, is an example of this feature.