| A | B |
|---|
| Inner Core | very center of the planet |
| Outer core | surrounds inner core |
| Mantle | thick layer of hot dense rock next to the outer core |
| Crust | rocky shell forming the Earth's surface |
| Continental drift | theory that continents were once joined and then slowly drifted apart |
| Plate tectonics | physical processes that create many of the Earth's physical features |
| Magma | molten rock |
| Pangaea | all land was hooked together |
| Fold | moving plates that squeeze the Earth's surface until it buckles |
| Fault | plate that grind or slide past each other creating cracks in the Earth's crust |
| Earthquake | sudden violent movements of tectonic plates along a fault line |
| Volcano | mountains formed by lava or magma that breaks through the Earth's crust |
| Ring of Fire | one of the most earthquake prone areas on the planet around perimeter of the Pacific Ocean |
| Tsunami | huge sea wave caused by an undersea earthquake |
