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31 Cards in this Set

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Seismic Waves
Vibrations that travel through earth carrying the energy released during an earthquake
Pressure
The force exerted on a surface divided by the area over which the force is exerted;force pressing on an area.
Crust
The layer of rock that forms earth's outer surface
Basalt
A dark dense igneous rock with a fine texture, found in an oceanic crust
Granite
A usually ligth colored igneous rock that is found in continental rock
Mantle
The layer of hot solic material between Earth's crust and core
Lithosphere
A rigid layer made up of the uppermost part of the mantle and the crust
Asthenosphere
The soft layer of the mantle on which the lithosphere floats
Outer Core
A layer of molten iron and nickel that surrounds the inner core
Inner Core
A dense ball of solid iron and nickel at the center of the earth
Radiation
Heat transfer through space
Conduction
Heat transfer within a material or between materials that are touching
Convection
Heat transfer by the movement of currents within a fluid
Density
A measure of how much mass there is in a volume of a substance
Convection Currents
The flow that transfers heat within a fluid, or the movement of a fluid, caused by differences in temperatures that transfers heat from one part of a fluid to another
Continental Drift
The hypothethis of continents slowly moved over earth's surface
pangea
the name of the of single landmass that broke200 milion years ago and gave rise to todays contients
fossil
any trace of an ancient organism that has been preserved in rock
mid-ocean ridge
an undersea mountain chain where new ocean floor is produced;a divergent plate boundry
sonar
a divice that bounces sound waves off underwater objects and then records the echoes of these sound waves
sea-floor spreading
The process by which molten materials adds new oceanic crust to the ocean floor
Deep-Ocean Trench
A deep valley along the ocean floor beneath which oceanic crust slowly sinks towards the mantle
Subduction
Process which ocean floor sink beneath a deep ocean trench and back into the mantle at a convergant plate boundary
Plate
A section of the lethosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust
Scientific Theory
A well tested concept that explains a wide range of observations
Plate Tectonics
Pieces of earth's lithospher are in constant motion driven by convection currents into the mantle
Fault
Breaks the earth's crust where rocks have slipped past each other from along these boundaries
Divergent Boundary
A plate boundary, where two plates move apart, move away, or diverge from each other
Rift Valley
A deep valley that forms where two plates move apart on land
Convergant Boundary
When two plates moe toward each other
transform boundry
a place where two plates slip past each other in the opposite directions