| Term | Definition |
|---|
| Normal fault | tension |
| Reverse fault | compression |
| Strike-slip fault | shear forces |
| primary waves | waves - travel through earth by causing particels in rocks to stretch apart in the direction of the wave, fastest |
| secondary waves | waves - travel through earth by causing particels in rocks to move at right angles to the direction of the wave, medium |
| surface waves | waves that reach earth's surface and travfel outward along Earth's surface from the epicenter |
| surface | which cause more damage? _____ waves |
| the epicenter is directly above the focus | relatinoship between epicenter and focus |
| 3 | how many seismic stations are needed to locate earthquake? |
| magnitude | ritcher scale measures ... |
| seismograph | machine that records primary, secondary and surface waves. |
| safety | secure water heater and other gas appliances, take heavy things off of shelves .. these are all _____ tips |
| divergent plate boundaries | earths plates move apart |
| convergent plate boundaries | earths plates move together |
| hot spots | areas in mantle, hotter than others |
| kilauea | most active volcano? |
| pinatubo | eruption of the century |
| geothermal energy | replaces fossil fules, reduces oil spills |
| hdr | pump water intp fractured ... (abrv.) |
| magma bodies | magma heat --> prouduce steam --> spins turbines --> runs generators --> makes electricity, what is this? |
| explosive | the more silica and gas content, the more .... |
| sheild | quiet |
| cinder cone | explosive |
| composite | can be explosive or quiet |
| batholith | largest intrusive rock -- forms when magma cools underground before reaching the surface |
| dike | magma squeezed a generally vertical crack, cuts across rockl layers + hardens |
| sill | magma squeezed a generally horizonal crack, between rock layers |
| volcanic neck | solid igneous rock core left behind when erosion wears away the cone of the volcano |
| caldera | large opening formed when a volcano collapses into the partially emptied magma chamber. |
| wegener | continental drift idea? |
| pangaea | continents once were all conected -- ? |
| fossil | remains of same species on different continents ... these are ____ clues |
| climate | fossils of warm weather plants have been foudn on continents by arctic circle ... these are ____ clues |
| rock | similar rock structures are found on diff. continents ... these are ____ clues |
| seafloor spreading | hot, less dense material in the mantle is forced upways to the surface at the mid-ocean ridge, causes expansion |
| lithosphere | crust+mantle |
| asthenosphere | everything below crust+mantle |
Combine with other sets
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