earth's layers
Terms
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- continental drift
- thery that continents were once a one continent but have since drifted apart; Wegner
- scientific theroy
- well tested concep that explains a wide range of observations
- lithosphere
- uppermust part of mantle related to the crust.
- convection
- heat trannsfering through currents within a fluid
- transform boundry
- when two plates past eachother in opposite direction; neither goes under; earthquakes
- panagea
- literally super continent; all the continets were together
- conduction
- heat transfering through contact with other particles within the substance; spoon to soup
- water's density
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- sonar
- finding location of by recording echos of sound waves, sound navigation ranging
- crust
- layer of rock that forms earth's outer surface; 100; 32 KM; granite/basalt
- plate tectonics
- S.T stating that listosheric plates are in a slow constant motion driven by convection currents in the mantle
- pressure
- force exerted on a surface divided by the total area over which a force is exerted
- divergent boundry
- when two plates move opposide direction; mid ocean ridge/land
- fault
- breaks in the earth's lithosphere where rocks have slipped past eachother
- mid ocean ridge
- a range of mt. in the middle of the ocean; new ocean floor is produced
- granite
- rock that makes up most of the continental crust
- rift valley
- in middle of mid ocean ridge; where new ocean floor is made- sea floor spreading
- plates
- irregular shaped pieces of the lithosphere; slowly moving over sthenosphere carring crust (both)
- deep ocean trench
- deep valley along ocean floor; subduction takes place
- outer core
- liquid; iron and nickle; 2200c; 5150KM
- convection current
- transfer haet through change in temp.
- fossil
- a preservation of an acient organism in rock
- density
- measure of the mass in a volume of a substance
- siesmic wave
- vibrations that travel through earth cring the energy of an earthquake, indirect evidence to whats happening in the core
- mantle
- second layer of the earth 2200c; magnesium, oxegen, iron, silicon; 2900KM
- subduction
- recycling of crust; when old ocean floor plunges int oa deep ocean trench
- athenosphere
- below lithoshsphere, morphish, part of mantle, still solid
- radiation
- transfers heat through space by electromagnetic waves
- inner core
- soild; 6500c, 6500KM; dense circle
- basalt
- rock that makes up most of the ocean floor's crust
- convergent boundry
- plate boundry where 2 plates come towards one another; dencer one goes on bottom