Chapter 16 Science Terms
Terms
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- seafloor spreading
- how new crust forms on the ocean floor
- focus
- exact spot inside Earth where an earthquake starts
- inner core
- solid core of Earth
- outer core
- liquid layer of Earth
- crust
- outer layer of earth
- mantle
- thickest and middle layer of earth
- seismograph
- instrument that measures the strength of earthquake vibrations
- Richter Scale
- used to compare the strenghts of earthquake, uses seismograph readings
- continental drift
- theory that continents have moved over time; developed by Alfred Wegener
- plate tectonics
- theory stating that Earth's surface is covered with moving plates
- Modified Mercalli Scale
- describes amount of damage caused by earthquakes, uses seismograph reading
- epicenter
- point where earthquake waves hit Earth's surface
- fault
- a crack in earths crust between two plates
- earthquake
- shaking of Earth produced by a quick release of energy