earthquake - shaking of the earth's crust caused by plate movements, seismologist - a scientist who studies earthquakes, fault - a crack in the earth at the boundary between two plates, focus - the underground starting point of an earthquake, usually found along a fault, epicenter - the location on the earth's surface directly above the focus, damage is usually the worst here, triangulation - using seismic data from 3 locations to pinpoint the exact location of the epicenter, seismic waves - how the energy of an earthquake moves through the ground, primary waves - arrive first, are faster, push and pull, move through solid and liquid, secondary waves - arrive second, are slower, move side to side or up and down, only move through solids, magnitude - the strength of earthquake waves, seismograph - a scientific instrument that records and measures earthquake waves, Richter Scale - a list of numbers (1-10) that helps to describe an earthquake's magnitude; each number is 10 times stronger than the last, tsunami - a series of larger than normal ocean waves caused by earthquakes, volcanoes, and landslides on the ocean floor,

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