what are plate boundaries yahoo answers
Submit. Â· just now. Report Abuse. Plate tectonics is the theory that the outer rigid layer of the earth (the lithosphere) is divided into a couple of dozen plates that move around across the earth's surface relative to each other, like slabs of ice on a lake.est Answer: the theory that the earth is made of massive plates beneath the surface that move every so often which is how we get earthquakes. and this also goes back to Pangea if you know what that is. Source(s): lovemeknotknot Â· 7 years ago.