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24 Cards in this Set
- Front
- Back
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What is an axis?
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An imaginary straight line running through the earth from pole to pole.
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What is a core?
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The center of a planetary body, such as the earth. There is an Inner Core and an Outer Core. Both cores are made of iron. THE OUTER CORE IS THE ONLY LAYER THAT IS A LIQUID!!! The pressure from all these layers is on top of the core makes the inner core solid. The pressure from everything is pressing down on the Inner Core making it a solid.
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What is the crust?
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The outermost zone of the solid earth. Makes up only 1% of the earth's mass.
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What is a mantle?
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The zone of rock below the earth's crust. Comprises nearly 2/3 of earth's mass. 2,870 km thick.
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What is the Moho?
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The Mohorovicic discontinuity, boundary between the earth's crust and mantle.
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What is a seismic wave?
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The vibration that travels through the earth?
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What is gravity?
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The force of attraction between all matter in the universe.
*** ISAAC NEWTON! |
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What is the law of gravitation?
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The principle that the force of attraction between 2 objects depends on the masses and the distance between the objects.
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What is the magnetosphere?
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A region of space that is affected by the earth's magnetic field.
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What is the shadow zone?
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The location on the earth's surface where no seismic waves or only P waves can be detected.
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What is the equator?
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An imaginary line that divides the earth into Northern and Southern Hemispheres.
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What is an oblate spheroid?
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A slightly flattened sphere.
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What is the hydrosphere?
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Made up of all the earth's water. The earth is 71% water, 97% of the water is salty, and the remaining 3% is fresh water.
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What is the atmosphere?
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It is the gases that surround the earth. It provides the air we breath and shields the earth from the sun's harmful radiation. Made up 78% nitrogen and 21% oxygen.
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What is mass?
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The amount of matter in an object.
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What is oceanic crust?
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The crust beneath the oceans.
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What is continental crust?
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The part of the crust on which the continents rest.
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What is the lithosphere?
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A rigid layer outer shell of the earth. It is made up of the solid portion of the uppermost part of the mantle and the crust above it.
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What is the asthenosphere?
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The region of the mantle below the lithosphere.
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What is plasticity?
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The ability of a solid to flow.
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What are P waves?
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primary waves, travel through liquids, solids and gases. travel fast
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What are S waves?
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secondary waves, only travel through solids. travel slow. **** travel only through solids! S waves --- Solids. Slower than p waves.
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What is weight?
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A measure of the strength of the pull of gravity on an object.
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What are Newtons?
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The unit that weight is measured in.
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