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Layers of the Earth Notes. Earth’s Layers Earth is divided into layers – 2 different ways Composition – What it’s made of Physical properties – What can.

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Presentation on theme: "Layers of the Earth Notes. Earth’s Layers Earth is divided into layers – 2 different ways Composition – What it’s made of Physical properties – What can."— Presentation transcript:

1 Layers of the Earth Notes

2 Earth’s Layers Earth is divided into layers – 2 different ways Composition – What it’s made of Physical properties – What can be observed/doesn’t change chemical properties Crust

3 Earth’s Layers by Composition Crust Core Mantle Core

4 Earth’s Layers by Composition Crust – Outermost layer – Thinnest layer – Composed mostly of oxygen, silicon, and aluminum – Two types Oceanic (found under oceans; more dense) – Twice as much iron, calcium, and magnesium which are more dense minerals Continental (found under land; less dense)

5 Earth’s Layers by Composition Mantle – Between the crust and core – Much thicker than crust – Composed of more magnesium and less aluminum and silicon than the crust so it is more dense than the crust

6 Earth’s Layers by Composition Core – Below the mantle; at the center of Earth – Makes up 1/3 of Earth’s mass – Composed primarily of iron and nickel Almost no oxygen, silicon, aluminum, or magnesium – Heats the mantle by convection

7 Earth’s Layers by Physical Properties Lithosphere Asthenosphere Mesosphere Outer Core Inner Core

8 Earth’s Layers by Physical Properties Lithosphere – Solid, outermost part of Earth Includes crust and rigid upper part of mantle – Divided into pieces called tectonic (or lithospheric) plates

9 Earth’s Layers by Physical Properties Asthenosphere – Found directly under the lithosphere – Tectonic (lithospheric) plates move on this layer – Made of solid rock that flows slowly

10 Earth’s Layers by Physical Properties Mesosphere – Found directly under the asthenosphere – Lowest part of the mantle – Very strong

11 Earth’s Layers by Physical Properties Outer Core – Found beneath the mesosphere – Liquid layer of Earth’s core – Surrounds inner core – Made of iron and nickel – Heats the mantle by convection

12 Earth’s Layers by Physical Properties Inner Core – Found beneath the outer core – Solid layer of Earth’s core Very dense – Made of iron and nickel

13 Earth’s Magnetic Properties Earth acts like a giant magnet Earth (like any manufactured magnet) exhibits 2 poles – North – South Earth’s outer core spins as Earth rotates – This creates the magnetic field

14 Compass A compass is composed of a small, light- weight magnet (called a needle) – Balances on a point One pole of the magnet will be attracted and point toward the Earth’s North Pole – This pole on the magnet is called the north pole of the magnet Compasses are used for navigation from any point on Earth’s surface – Possible because of Earth’s magnetic field

15 Layers of Earth Comparisons Lithosphere Mesosphere Asthenosphere Outer Core Inner Core Core Mantle Crust PHYSICAL PROPERTIES COMPOSITION

16 Layers of Earth Comparisons Lithosphere Mesosphere Asthenosphere Outer Core Inner Core Core Mantle Crust PHYSICAL PROPERTIES COMPOSITION

17 Layers of Earth Comparisons


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