Layers of the Earth
Presentation
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Science
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6th Grade
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Practice Problem
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Hard
Melissa Nelson
Used 29+ times
FREE Resource
33 Slides • 0 Questions
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Layers of the Earth
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Journey to the Center of the Earth
Watch the movie trailer for Journey to the Center of the Earth. Identify characteristics that you think are true and those you think are not true. Be prepared to share.
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The Earth is made up of 3 main layers:
Crust
Mantle
Core
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Think of the layers of the Earth like the layers of a cake.
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Draw the Layers of the Earth in your notebook. Include the DOWN arrow!
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Crust
Thinnest layer of the Earth that ranges from only 2 miles in some areas of the ocean floor to 75 miles deep under mountains
Made up of large amounts of silicon and aluminum
Two types of crust: oceanic crust and continental crust
Composed of plates on which the continents and oceans rest
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The Earth’s crust is like the skin of an apple. Turn to an elbow partner and discuss why this statement is true. Next, come up with another example.
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Mantle
Solid but capable of flow (like hot asphalt or fudge)
Thickest layer of the Earth (making up 70% of the Earth’s mass)
The hot material (magma) in the mantle rises to the top of the mantle, cools, then sinks, reheats, and rises again. These convection currents cause changes in the Earth’s surface
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Outer Core
Molten (liquid) metal that is about 4,700°C (8,500°F)
Located about 1,800 miles beneath the crust and is about 1,400 miles thick
Composed of the melted metals nickel and iron
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Inner Core
Solid sphere composed mostly of iron
It is believed to be as hot as 6,650°C (12,000°F)
Heat in the core is probably generated by the radioactive decay of uranium and other elements
It is solid because of the pressure from the outer core, mantle, and crust compressing it tremendously
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The Earth is like a peach or a boiled egg. Discuss. Come up with another analogy and be prepared to share.
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Which layer of the Earth has the greatest temperature, pressure, and density?
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Summary
The earth is layered with a lithosphere (crust and uppermost mantle), convecting mantle, and a dense metallic core.
Pressure, temperature, and density increase as depth increases.
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Layers of the Earth
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