#143 Plates

In geologic terms, a plate is a large, rigid slab of solid rock. The word tectonics comes from the Greek ___ "to build". Putting these two words together, we get the term plate tectonics, which ___ to how the Earth's surface is built of plates. The theory of plate tectonics ___ that the Earth's outermost layer is ___ into a dozen or more large and small plates that are moving ___ to one another.