The Earth's crust is made up of 15 major tectonic plates and many smaller ones.

Here are the major plates:

* African Plate

* Antarctic Plate

* Arabian Plate

* Australian Plate

* Caribbean Plate

* Cocos Plate

* Eurasian Plate

* Indian Plate

* Juan de Fuca Plate

* Nazca Plate

* North American Plate

* Pacific Plate

* Philippine Plate

* Scotia Plate

* South American Plate

These plates are constantly moving and interacting with each other, leading to various geological phenomena like earthquakes, volcanoes, and mountain formation.