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25 Cards in this Set
- Front
- Back
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What is an imaginary line that divides the earth into the Northern and Southern Hemispheres.
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Equator
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Flattened sphere
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Oblate spheroid
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An imaginary straight line running through the earth from the North Pole to the South Pole
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Axis
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All the earth's water - 71% of earth's surface covered by water. 97% salty, 3% fresh - in glaciers, lakes, streams and groundwater
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Hydrosphere
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Thick blanket of gases sourrounding the earth - 78% Nitrogen, 21% Oxygen
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Atmosphere
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Vibrations that travel through the earth
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Seismic Waves
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The thin, solid outermost zone of the outer covering - 1% of earth's mass
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Crust
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Amount of matter in an object
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Mass
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Beneath the ocean, the crust
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Oceanic Crust
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The part of the crust that the contients rest
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Continental Crust
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Zone of rock below the crust - 66% of earth's mass
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Mantle
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thin outershell of the earth consisting of the crust and the rigid upper mantle
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Lithosphere
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below the lithosphere, a region of the mantle, SOLID!! but flows under pressure - 200 Km thick
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Asthenosphere
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below the mantle; made of Iron
Outer - liquid iron Inner - solid iron |
Core
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Boundary between the mantle and crust
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The Moho
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Location on the earth's surface where no S waves or only P waves can be detected
S shadow: further than 103 deg P Shadow: between 103 and 143 degrees |
Shadow Zones
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Region of space that is affected by the Earth's magnetic feild
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Magnetosphere
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Force of attraction that exists between all matter in the universe
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Gravity
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Principal that the force of attraction between two objects depends on themasses and the distance between the objects
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Law of gravitation
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Amount of gravitational forcewhich is exerted on a body
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Weight
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Unit of force named after Isaac Newton
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Newtons
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Ability of a solid to flow
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Plasticity
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P waves
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Primary waves
Fastest waves Travels through solids liquids gases Particles move parallel to direction of wave |
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S waves
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Secondary or shear waves
Slower than P waves Travel only through solids Particles move PERPENDICULAR to direction of wave (as in side/side, up/down) |
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The rule of seismic waves
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Seismic waves move faster through material which is more rigid/dense
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