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Earths Internal Composition Integrated Science. There are two classification system The Earths...
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Transcript of Earths Internal Composition Integrated Science. There are two classification system The Earths...
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Earth’s Internal CompositionIntegrated Science
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There are two classification system
• The Earth’s interior has two different classification systems– System 1
• Crust• Mantle (Outer and Inner Mantle)• Core
– System 2• Lithosphere• Asthenosphere• Lower Mantle• Outer Core• Inner Core
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System 1 – Based on elements that make it up.
• 3 Layers…like an egg– The crust is like an egg’s shell.– The mantle is like the egg white.– The core is like the egg’s yolk.
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The Crust
• The crust is dirt and rock.– Made mostly of silicon and oxygen.
• It has two parts.– Continental Crust (Land)– Oceanic Crust (Ocean)
• The oceanic crust is much thinner than the continental crust.– Oceanic = 7 km – Continental = 40 km
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The Crust
• Mountains in the continental crust have “roots”
• As the mountains wear away, they weigh less and the “roots” are pushed upwards.– This is a vertical movement. (upwards)• Vertical movement of the crust is called isostasy.
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The Mantle
• It is made of a thick liquid, hot rock.– Mostly magnesium, oxygen, and silicon
• It is the majority of Earth’s interior.• It is more dense than the crust.• It has two parts– The upper mantle– The lower mantle
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The Core
• The core is liquid metal.– Mostly iron
• The core is the most dense of the three layers.
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System 2 – Based on Physical Properties (states of matter)
• Lithosphere– Crust and upper mantle
• Asthenosphere– Middle part of the mantle
• Lower Mantle– The lowest part of the mantle
• Outer Core– Core
• Inner Core– Core
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The Lithosphere
• Cool, hard rock.• Broken into tectonic plates.• On average, 100 km thick (crust = 40 km).
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The Asthenosphere
• It is soft rock but still flows like a liquid. – Like Silly Putty– Called “plastic”
• Its ability to move is important.– The Lithosphere’s tectonic plates float on the
Asthenosphere.– Responsible for movement of continents.
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The Lower Mantle
• Made of solid rock.
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The Outer Core
• Hot, Liquid Metal• As the Earth rotates the outer core moves and
flows– This movement produces Earth’s magnetic field
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The Inner Core
• Made of hot, solid metal– Under intense pressure
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