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25 Cards in this Set

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