| A | B |
|---|
| geologists | scientists who study forces that shape Earth |
| constructive forces | build up mountains and landmasses |
| destructive forces | wear away mountains and other features on Earth |
| crust | layer of rock that forms Earth's outer skin |
| mantle | layer of hot rock below crust |
| oceanic crust | lies beneath most of the ocean floor |
| continental crust | makes up all the lands of the continents |
| outer core | layer of molten metal around inner core |
| inner core | dense ball of solid iron and nickel |
| tsunamis | earthquakes under the ocean |
| volcanoes | most form near colliding plate boundaries |
| magma | As one plate move below another plate, rock partially melts to make this: |
| epicenter | The place on Earth's surface above a focus is called this. |
| focus | the place where the plates slip |
| plates | parts of the lithosphere that are broken into pieces that fit closely together |
| fault | a break in Earth's crust |
| plate boundaries | edges of the plates are called this. |
| earthquakes | most often occur at faults that are along plate boundaries |
