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Earth Science:

Earth Science:. General area of science that studies the process that change the Earth’s surface. Have you ever eaten a boiled egg?. How many layers does it have? How are the Earth and a boiled egg the same? An answer: They both have layers. Layers of the Earth. Earth has 3 layers.

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Earth Science:

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  1. Earth Science: • General area of science that studies the process that change the Earth’s surface.

  2. Have you ever eaten a boiled egg? • How many layers does it have? • How are the Earth and a boiled egg the same? • An answer: They both have layers.

  3. Layers of the Earth • Earth has 3 layers

  4. 1st Layer: Crust (Lithosphere – which is crust + solid part of the mantle): • 1% of Earths mass. Thinner layer. • 5km-60km (5-25 miles) thick. • Where life lives.

  5. Continental Crust: *Under continents *Made of oxygen, silicon, and aluminum. *Heavy Granite rock. Oceanic Crust: *Under Ocean. *Made of iron, calcium, and magnesium. *Thin and dense crust. *Made of volcanic rock (Basaltic Rock). Two types of Crust

  6. ___________ is the first layer of the Earth.

  7. Labels 1st Layer of the Earth

  8. 2nd layer Mantle • 1. Mohorovičić (Pronounced MOE-hoe-roe-VIT-jich and also called Moho) discontinuity: Area that separates crust from mantle. • 2. 67% of Earth’s mass. • 3.Thickest layer. 2,900 Kilometers (1,800 miles). • 4. Made of magnesium, less silicon and aluminum. • 5. More dense than crust.

  9. 6.Has three areas: • 1st 100km (62miles), very rigid rock. Temp: 870 degrees C (1,600 F). • 2nd area 100km-250 km (155 miles), close to melting point. Like plastic (toothpaste). This is magma. • 3rd area 250 km-2,900km rigid solid rock again. 2,200 C (4,000 F). • Mantle rock pushes through crust. Scientists study it.

  10. Asthenosphere: • Portion of mantle just below Lithosphere (the crust and solid part of the mantle) • Plastic-like: very close to melting point, but pressure keeps it from being melted. So small changes in temperature or pressure can change it in to molten (melted or liquid) rock

  11. Label the 2nd layer of the Earth.

  12. Crust that is under the ocean • Crust that is under continents

  13. 3rd Layer Core:Two Cores (32% of Earth’s Mass) • Outer Core: • Melted iron and nickel. • 2,270 km (1,398 miles) thick • 2,200-5,000 degrees C.

  14. Inner Core: • Solid iron and nickel. Caused by pressures from above layers. • Radioactive • Magnetic • 1,216 km to center. • 4,300 degrees C

  15. Label the 3rd Layer of the Earth

  16. Homework Discussion • You will write a creative story about a journey to the center of the Earth • It will include: • Each of the 3 major layers of the Earth • At least 3 facts about EACH layer • Facts can be from slides • And/or you may research facts on your own • Science related illustrations of a well-written story may result in extra credit (think a map of the journey)

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