What Is a Tectonic Plate and How Many Tectonic Plates Are There That Ride On the Asthenosphere?
The earth’s crust is not one continuous shell, but instead is broken up into many pieces, which scientists call tectonic plates. No one is sure how many plates there are, but the number is probably between 20 and 40. The continents rest on top of these plates, and over millions of years the plates bearing the continents have bee
