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| 9861132573 | Subduction | is the process by which denser oceanic lithosphere sinks back into the asthenosphere to melt and become magma -occurs at oceanic convergent boundaries (plates move together or collide) |  | 0 |
| 9861132574 | Mid-Ocean Ridge | a chain of mountain ranges (longest chain in the world) on the ocean floor where new oceanic crust forms -forms at a divergent plate boundary where oceanic plates move away from each other |  | 1 |
| 9861132575 | Convection Currents | A circulation pattern in which material is heated and rises in one area, then cools and sinks in another area, flowing in a continuous loop -occurs in the asthenosphere -diving force of the movement of the tectonic plates (lithosphere) |  | 2 |
| 9861132577 | tectonic plates | huge moving slabs of solid rock - broken up pieces of the lithosphere that move on top of the asthenosphere -like pieces of a puzzle |  | 3 |
| 9861132578 | lithosphere | Crust and the uppermost part of the mantle (tectonic plates) |  | 4 |
| 9861132579 | Plate Tectonic Theory | Theory that Earth's lithosphere is divided into tectonic plates. Movement of Earth 's plates in the lithosphere which may be caused by oceanic plates subducting beneath continental plates and convection in the mantle |  | 5 |
| 9861132581 | Convergent boundary | the boundary formed by the collision of two tectonic plates (lithosphere) - plates moving towards each other |  | 6 |
| 9861132582 | Divergent Boundary | the boundary between two tectonic plates that are moving away from each other |  | 7 |
| 9861132583 | Transform boundary | the boundary between tectonic plates that are sliding past each other in opposite directions - these plates grind and jerk as they slide which produces Earthquakes |  | 8 |
| 9861132585 | faults | the surface along which rocks break and slide past each other |  | 9 |
| 9861132586 | Volcanic Mountains | Usually forms at Continental- Oceanic Convergent Plate Boundaries where oceanic crust sinks into the asthenosphere at subduction zones |  | 10 |
| 9861132587 | Continental-Continental Collisions | when two plates with continental crust collide, buckle and thicken, and pushes the continental crust upward, forms mountains |  | 11 |
| 9861132588 | Continental-Oceanic Collisions | when a plate with oceanic crust collides with a plate with continental crust, the denser oceanic crust is subducted by into the asthenosphere where it melts and turns into magma - Volcanic Mountain and ocean trenches can form here |  | 12 |
| 9861132589 | ocean trench | a long narrow steep-sided depression in the earth's oceanic crust |  | 13 |
| 9861132590 | Oceanic-Oceanic Convergent Collisions | when two oceanic plates collide, the plate that is older and more dense is subducted underneath the less dense plate -Island Arcs can form |  | 14 |
| 9861132591 | Oceanic-Oceanic Divergent Boundary | forms where two oceanic plates separate (pull away) form each other -Ex. Mid-Ocean Ridge |  | 15 |
| 9861132592 | Continental-Continental Divergent Boundary | forms where two continental plates pull away from each other -Rift Valley can form |  | 16 |
| 9861172976 | Epicenter | Imaginary point on earth's surface that pinpoints an earthquake, directly above the focus |  | 17 |
| 9861185101 | Focus | Earthquake origin inside the earth |  | 18 |
| 9861192289 | Mercalli intensity scale | Measures an earthquake's intensity, how people feel during an earthquake and the amount of damage caused to property. On a scale of I to XII |  | 19 |
| 9861197976 | Richter scale | Measures an earthquake's magnitude; the amount of shaking the ground does due to the amount of energy released. Measured on a scale from 0-??? |  | 20 |
| 9861205152 | Magma | Molten rock beneath Earth's surface |  | 21 |
| 9861210312 | Lava | Molten material/rock on Earth's surface |  | 22 |
| 9861250707 | Volcanic regions | Mid-Atlantic Ridge, Pacific Ring of Fire, Hawaiian Islands and other hot spots | 23 | |
| 9861257414 | Mountains | Formed when one plate subducts another, convergent boundary, and at a hot spot or where hot rock comes up like where volcanoes form. |  | 24 |
| 9861269121 | Seismometer/seismograph | Measures seismic waves , useful in monitoring volcanic and earthquake activity |  | 25 |
| 9861339156 | Evidence of Continental Drift Theory | Mesosaurus fossils on different continents, climate, continents seeming to fit together, Mountains of similar age and structure on different continents, glacial scratches on continents in the tropics |  | 26 |
| 9861526741 | rift valley | long, narrow depression formed at divergent boundaries |  | 27 |
