| A | B |
|---|
| core | the center of the earth |
| mantle | the middle layer of the earth |
| crust | the surface of the earth |
| subduction zone | the area where one tectonic plates slide under another |
| convergent boundary | two tectonic plates push into one another |
| divergent boundary | two tectonic plates move away from one another |
| transform boundary | two tectonic plates slide past each other |
| continental drift | continents can move apart from each other and have done so in the past |
| pangaea | all lands, the old supercontinent |
| tectonic plates | the peices of the crust that move around on the mantle |
| fault | the surface where rocks break and slide past each other |
| normal fault | happen where tectonic forces pulls the rocks apart |
| reverse fault | happen where tectonic forces push the rocks together |
| stike- slip fault | happen where tectonic forces cause rocks to break and slide past each other |
| seismograph | instrument that records seiesmic waves |
| 1964 | when the largest earthquake in North America happened in Alaska |
| 131 | The number of people that died in the 1964 Good Friday earthquake. |
| Richter scale | used to measure earthquake strength |
