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VOLCANOES-NADIA
| Question | Answer |
|---|---|
| continental drift | wegners hopthesis that all contents were once connected in a single large landmass that broke apart about about 200 million years ago and drifted slowly to their current positions |
| pangea | large anctient landmass that was composed of all the contients joined together |
| seafloor spreading | hess's theory that new seafloor was formed when maga is forced upward toward the surface at a midocean ridge |
| plate tectonics | theory that earths crust and upper mantle are broken into plates that float and movie around on a plasticlike layer of the mantle |
| plate | a large section of earths oceanic or continental crust and rigid upper mantle that movies around on the athenosphere |
| lithosphere | rigid layer of earth about 100 km thick made of the crust and a part of the upper mantle |
| athensosphere | plasticlike layer of earth on which the lithospereic plates float and move around |
| convection current | current in earths mantle that transfers heat in earths interior and is the driving force for plate tectonics |
| earthquake | vibrations produced when rocks break along a fault |
| primary waves | siesmic wave that movs rock particles back and forth in the same direction that the wave travels |
| secondary waves | siesmic wave that moves rock paerticles at a right angle to the direction of the wave |
| surface waves | seismic wave that movies rock particles up and down in a backward rolling motion and side to side in a swaying motion |
| epicenter | point on earths surface directly above and eathquakes focus |
| seismograph | instrument used to register earthquake waves and record the time that each arrived |
| volcano | opening in earths surface that erupts suliferous gases, ashh and lave; can form at eaths plate boundaryes where plate move apart or together and at hot spots |
| vent | opening where magme is forced up and flows out onto earths surface as lava forming a volcano |
| crater | steep walled depression around a volcanos vent |
| hot spot | the result of an unusually hot area at the boundary between earths mantle and core that forms volcanoes when malted rock is forced upward and breaks through the crusts |
| shield volcano | broud gently sloping volcano formed by quiet eruptions of basaltic lava |
| cinder cone volcano | steep sided loosely packed volcano formed when tephra falls to the ground |
| cinder cone volcano | steep sided loosley packed volcano formed when tephra falls to the ground |
| tephra | bits of rock or solidified lava dropped from the air during an explosive volcanic eruption; ranges in size from volcanic ash to volcanic bombs and blocks |
Created by:
nerdsquad1
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