The Earth's Core -...
Transcript of The Earth's Core -...
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The Earth's Interior
Chapter 8
Objectives:-Describe the composition of the Earth's inner and outer core.
-Identify the main features of the Earth's mantle.
-Define the term lithosphere.
-Differentiate between oceanic and continental crust.
-Define the term asthenosphere.
-Explain how geologists were able to construct a model of the Earth's interior.
Terms to Know:-Lithosphere -Mantle -Earth's core-Convection cells -Radioactive Decay -Friction-Residual heat -Crust -Oceanic crust-Continental Crust -Asthenosphere -Inference
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The Earth's Interior
The Earth's interior consists of a solid inner core, a liquid outer core, mantle, and crust.
The Earth's Core
-The very _________ of the Earth.
-Composed of _____ layers.
-Composition of both layers is believed to be ________ and __________.
1,800 mi (2,897 km) to reach outer core
3,200 mi (5,100 km) to reach inner core
Earthquake generate seismic waves that ripple through the solid Earth
When P waves reach the solid layer, they bend again.
When P waves hit the liquid or partial liquid layer, they bend.
All that bending of waves creates a 'shadow' where no P waves reach seismographs on the Earth's surface.
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Temperatures in the Core
Temperature in Fahrenheit
7,200
9,000
Depth in Miles
1,250
2,500
4,000
-Temperatures up to 8,000 F (4,427 C)
-Heat generated by _______________, __________, and residual _______ left over when the planet formed.
The Mantle-Makes up most of the Earth's total ______________.
-Composed of hot _________ material consisting of:-silicon-oxygen-iron-aluminum-magnesium
-Exposed to extremely high _______________.
1,800 mi (2,897 km) thick
The LithosphereSolid outer portion of the Earth's interior composed of the solid ____________ and the upper portion of the ____________.
-Upper part of the ____________.-Composed of a ______________ material.-Heat from the core rises up through the mantle creating ____________________.
Asthenosphere
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The Crust• Outer part of the Earth composed of solid rock which "floats" on the _____________.
• 99% of the crust is composed primarily of:-___________* -_________* -aluminum-iron -calcium -magnesium-sodium
Crust
*Make up _____% of the rocks in the crust
Oceanic Crust• Less than ___ mi (10 km) thick
• Average density of ___ g/cm3
• Composed of mainly ____________ rocks formed under pressure.
Continental CrustAs much as ____ mi (64 km) thick
Average density of _____ g/cm3
Composed mainly of _________ rocks
Review QuestionsPage 179Questions 1 6
Earth MathPage 179Questions 1