The Earth ’s Interior - QuiaThe Model of Earth ’s Interior Model developed using seismic waves Also studied inner composition of meteorites • Helps in understanding Earth ’s
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Objectives: 1) Draw a picture illustrating the different parts of the earth’s interior. 2) Write a simple description of the earth’s crust (lithosphere), mantle, inner core, and outer core.
�� 1,800 miles to outer core1,800 miles to outer core
�� 1,300 miles to inner core1,300 miles to inner core
�� Core is extremely hotCore is extremely hot–– 8,0008,000°°FF
�� Impossible to observe directly because Impossible to observe directly because it is so hot and has extremely high it is so hot and has extremely high pressurepressure
�� Extreme heat comes from:Extreme heat comes from:
1) Radioactive decay1) Radioactive decay
2) Friction2) Friction
3) Residual heat3) Residual heat
�� Upper mantle called the Upper mantle called the asthenosphereasthenosphere
•• Flows like thick syrupFlows like thick syrup
•• The rocks in this upper portion of the The rocks in this upper portion of the mantle are more rigid and brittle because mantle are more rigid and brittle because of cooler temperatures and lower of cooler temperatures and lower pressures. pressures.
�� LithosphereLithosphere——solid outer crust of Earthsolid outer crust of Earth•• Made up of rock and hot plasticMade up of rock and hot plastic--like upper like upper
mantlemantle
�� Thickness from 40 miles to 3 milesThickness from 40 miles to 3 miles•• 40 miles under mountains40 miles under mountains
EarthEarth’’s Crust s Crust ((continuedcontinued))
�� Oceanic crust made of basaltOceanic crust made of basalt
�� Earth floats on top of upper mantleEarth floats on top of upper mantle•• Like a cracker floating on soupLike a cracker floating on soup
�� Seven elements make up 99 percent of crustSeven elements make up 99 percent of crust•• Oxygen and silicon form 72 percent of the crustOxygen and silicon form 72 percent of the crust
•• Aluminum, iron, calcium, magnesium, sodium form Aluminum, iron, calcium, magnesium, sodium form remainderremainder
�� Lower crust and upper mantle form the Lower crust and upper mantle form the asthenosphereasthenosphere (plastic like)(plastic like)