| A | B |
|---|
| Seismic Waves | Produce when earthquakes occur |
| Pressure | The force pushing on a surface or area |
| Crust | A layer of rock that forms Earths outer skin |
| Mantle | A layer of hot rock |
| Lithosphere | The uppermost part of the mantle and the crust together form a rigid layer |
| Asthenosphere | The soft layer |
| Outer Core | A layer of molten metal that surrounds the inner core |
| Inner Core | A dense ball of solid metal |
| Heat Transfer | The movement of energy from a warmer object to a cooler object |
| Radiation | The transfer of energy through an empty space |
| Conduction | Heat transfer by direct contact of particles of matter |
| Convection | Heat transfer by the movement of a heated fluid |
| Density | A measure of how much mass the is in a volume of a substance |
| Continental Drift | Wegeners idea that the continents slowly moved over Earths surface |
| Fossil | Any trace of an ancient organism that has been preserved in rock |
| Mid-ocean ridge | The longest chain of mountains in the world |
| Sonar | A device that bounces sound waves off under water objects and then records the echoes of the sound waves |
| Sea floor spreading | The process that continually adds new material to the ocean floor |
| Deep ocean trenches | Deep ocean water canyons |
| Subduction | The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle |
| Plates | The lithosphere is broken into separate sections |
| Scientific Theory | A well tested concept that explains a wide range of observations |
| Plate Tectonics | The geologic theory that states that pieces of Earths lithosphere are in constant, slow motion, driven by convection currents in the mantle |
| Faults | Breaks in earths crusts where rocks have slipped past each other |
| Transform Boundary | A place where two plates slip past each other |
| Divergent boundary | A place where two plates move apart |
| Rift valley | A deep valley |
| Convergent boundary | A place where two plates move together |
