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29 Cards in this Set

  • Front
  • Back
true shape of earth; slightly flattened sphere, due to earth's rotation
oblate spheroid
imaginary striaght line which runs through the earth from the North Pole to the South Pole
all the earths water
percentage of earth's water which is salty
layer of gases surrounding the earth
what are the two most abundant gases in atmosphere and their percentages?
78% nitrogen and 21% oxygen
thin, sold outermost zone of the earth; makes up 1% of earth's mass
crust underlying world's oceans; thin, only 5-10 km thick
crust underlying earth's continetns. vaires 32 -70 km in thickness-thickest under mountains
zone of rock nearly 2870 km thick which lies below the earth's outermost layer; divided into upper and lower regions, this zone makes up 2/3 of the earth's mass
this is the uppermost portion of the mantle, and TOGETHER WITH THE CRUST ON TOP OF IT - forms a rigid layer which is 65 - 100 km thick
below core this is about 200 km thick. It is sold rock, but because of enormous heat and prssure, this layer flows like putty
The term which describes the ability of a solid to flow
Forms the center of the earth, divided into inner and outer sections - made mostly of iron, this layer makes up 1/2 of the earth's mass
Dense layer of liquid iron about 2,190 km thick
outer core
Dense sold about 2,680 km diameter at the very center of the earth - mostly iron
inner core
Vibrations which originate at or near earth's surface due to earthquake or explosion and move through the earth
seismic waves
faster of two seismic wave types; they can move through solid, liquid or gas
P waves
Slower of two seismic waves types; they can only move through solid materials
S waves
Seismic waves travel ? through material which is more dense/rigid
Short for Mohorovocic Discontinuity, this is the boudary between the crust and the mantle. Discovered because seismic waves speed up as they leave the less dense crust and enter the more dense mantle.
Locations on the earth more than 103 degrees from earthquake/explosion causing seismic waves where no secondary waves are felt, due to the fact that they cannot get through the liquid outer core of the earth.
S wave shadow zone
Locations on the earth more than 103 degrees but less than 143 degrees from earthquake/explosion causing seismic waves where no secondary waves are felt, due to the fact that they cannot get through the liquid outer core of the earth.
P wave shadow zone
Region of space (shich extends out past the atmosphere) affected by the earth's magnetic field
Motions within this layer of the arth are thougth to be responsible for the creation of earth's magnetic field
liquid iron outer core
Force of attraction which exists between all matter in the universe- the most imporant things you will learn about all year. Its the law!
the amount of matter in an object
the amount of gravity force exerted on a mass
The amount of gravitiational attraction between two objects depends upon: 1) the MASSES of the two objects and 2) the DISTANCE between the two objects
Law of Gravitation