Question

what physical evidence exists to support the theory of plate tectonics

Answer 1

Oh, this is a fun question!
First of all, look at the shape of the continents. They fit together into a similar shape as Pangea.
Now, look at the animals on some continents and the animals on the others. Russia and Alaska is a good example. The animals got from Alaska to Russia and vice versa because the continents used to be together until they were split.
Do you need more examples?

Answer 2

You can also use fossils of plants. The plants that are found in fossils in say Northern Canada are tropical plants. Northern Canada is not tropical, therefore the plants must have been somewhere else to grow, and become fossils.