Explanation:

Plate tectonics is the theory that explains the movement of plates, which are huge slabs of rock that make up the Earth's crust. The rate of plate movement varies across the globe, depending on the type of boundary between the plates.

Arctic Ridge has the slowest rate of plate movement.

- Divergent plate boundary: The boundary between two plates that are moving apart from each other is called a divergent plate boundary. The Mid-Atlantic Ridge is the most famous example of a divergent plate boundary where the North American Plate and Eurasian Plate are moving away from each other at a rate of about 2.5 centimeters per year.
- Convergent plate boundary: The boundary between two plates that are moving towards each other is called a convergent plate boundary. The East Pacific Rise is an example of a convergent plate boundary where the Pacific Plate is moving towards the North American Plate at a rate of about 8 centimeters per year.
- Transform plate boundary: The boundary between two plates that are sliding past each other is called a transform plate boundary. The San Andreas Fault is an example of a transform plate boundary where the Pacific Plate is sliding past the North American Plate at a rate of about 5 centimeters per year.

The Arctic Ridge is a divergent plate boundary where the North American Plate and the Eurasian Plate are moving away from each other at a rate of about 2 centimeters per year. This is the slowest rate of plate movement among all the plate boundaries.

In conclusion, the slowest rate of plate movement can be seen in the Arctic Ridge, which is a divergent plate boundary.