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25 Cards in this Set
- Front
- Back
axis
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imaginary straight line running through the Earth from pole to pole
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core
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center of a planetary body, such as Earth
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crust
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outermost zone of solid Earth
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daylight savings time
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system in which clocks are set one hour ahead of time from April to October
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geosynchronous orbit
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orbit directly above Earth's equator and moving in the direction of Earth's rotation
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gravity
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force of attraction between all matter in the universe
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law of gravitation
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principle that the force of attraction between two objects depends on the masses and the distance between the objects
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magnetosphere
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a region of space that is affected by the Earth's magnetic field
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mantle
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zone of rock below Earth's crust
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equator
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an imaginary line that divides the earth into the Northern and Southern Hemispheres
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oblate spheroid
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a slightly flattened sphere
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hydrosphere
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all of the earth's water (71% of Earths' surface: 97% is salt water, 3% is fresh water)
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oceanic crust
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the crust beneath the ocean
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continental crust
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the part of the crust which the continents rest (its thickest beneath the mountains)
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lithosphere
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the solid portion of the mantle and the crust above it
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asthenosphere
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the region of the mantle that lies below the lithosphere
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plasticity
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the ability of a solid to flow
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waves
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useful to scientists exploring the earth's interior
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Mohorovicic discontinuity/Moho
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the boundary at which the change in the speed of waves marks the crust between the mantle
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shadow zones
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locations on the earth's surface where neither S waves nor P waves are detected or where only P waves are detected
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weight
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a measure of the strength of the pull of gravity on an object
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atmosphere
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a blanket of gases that surround Earth. It provides the air we breathe and shields the earth form the sun's harmful radiation
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seismic waves
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vibrations that travel through Earth
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mass
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the amount of matter in an object
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newtons
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what weight is measured in
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