I have read that the edges of the tectonic plates exist at places like: huge mountains and sea trenches, and I wondered if they exist at the mid-oceanic ridges?
The short answer is yes, the edges (boundaries) of tectonic plates do occur at the mid-oceanic ridges, such as the Mid-Atlantic ridge.
There are three types of tectonic plate boundaries:
- Transform Boundaries where the plates slide past each other sideways, such as at the San Andreas Fault.
- Divergent Boundaries where the plates are moving apart, such as the Mid-Atlantic Ridge and the East African Rift.
- Convergent Boundaries where one plate slides beneath the other plate, such as the Andes mountain range & the Japanese island arc.