How many primary tectonic plates make up the surface of Earth?
There are about 7 or 8 primary tectonic plates. The lithosphere is made of about a dozen plates. The plates fit together like the pieces of a jigsaw puzzle. However, the plates can move. This causes earthquakes, volcanoes, and mountains to form. Hope it helps
There are 15 to 20 primary tectonics that make up the surface of Earth. They are called Lithosphere.