Earth Science

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convergent
boundaries that come together in order to form mountains
divergent
boundaries that move apart and form volcanoes
transform
boundaries that slide past each other and create earthquakes
destructive
forces that destroy the earth
constructive
forces that build up the earth
fault
a break at the earth's crust that causes an earthquake
weathering
the breakdown of rock
erosion
the movement of sediment from one place to another
deposition
the dropping of sediment
seismograph
a device that is used to measure and predict earthquakes, volcanoes, and tsunamis
delta
a landform that is created at the mouth of a river as the river flows into a larger body of water
sediment
rock, dirt, soil, sand
landslide
the sudden movement of rock downhill because of gravity
glacier
a large, slow moving piece of ice
gravity
the force that pulls all object towards the earth
floodplain
a wide, flat area that is formed when a river overflows onto the land and drops sediment
moraine
a ridge of rock and soil that is deposited when a glacier melts
dam
a structure built across a river to control flooding
levee
a ridge of sediment that is built to control flooding onto land (that is below sea level)
groin
a structure built at right angles to a beach to prevent beach erosion
seawall
a structure built parallel to a beach to prevent erosion and weathering
beach nourishment
a method used to build up beaches again after they have eroded away
contour plowing
a method that farmers use to prevent erosion of topsoil
terracing
a method that farmers use to prevent erosion of topsoil (looks like stairs)

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