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Earth Science 703
7th grade science terms
Question | Answer |
---|---|
lithosphere | rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle. |
continental drift | Wegener's hypothesisthat all the continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positioins. |
Pangaea | large, ancient landmass that was composed of all the continents joined together |
crust | the outer most layer of the Earth |
earthquake | movement of the ground that occurs when rocks inside Earth pass their elastic limit, break suddenly, and experience elastic rebound |
equator | imaginary line that wraps around Earth at zero degrees latitude, halfway between the north and south poles |
latitude | distance in degrees north or south of the equator |
longitude | distance in degrees east or west of the prime meridian |
lava | molten rock flowing onto Earth's surface |
magnitude | a measure of the energy released by an earthquake |
seafloor spreading | Hess's theory that new seafloor is formed when magam is forced upward toward the surface at a mid-ocean ridge |
volcano | cone-shaped hill or mountain formed when hot magma, solids, and gas erupt onto Earth's surface through a vent |
Earth Science | study of Earth and soace, include\ing rocks, fossils, climate, volcanoes land use, ocean water, earthquakes, and objects in space |
convection current | current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonincs |