Ch. 1.1 Earth’s Interior - PowerPoint PPT Presentation

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Ch. 1.1 Earth’s Interior
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Ch. 1.1 Earth’s Interior

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  1. Ch. 1.1 Earth’s Interior

  2. A. The Science of Geology 1. Geologist -- scientists studying the forces that make and shape planet Earth. Study Rock for- • chemical, physical properties • mapping location • describe landforms and features • clues to Earth’s history

  3. B. Studying Surface Changes 1. What causes Earth’s surface to change? a). Constructive Forces • Build up mountains and landmasses • Ex: island formation b). Destructive Forces • Wear away mountains and other features on the surface • Ex: water and/or wind

  4. C. Finding Indirect Evidence 1. Seismic waves a). study how they travel through Earth b). Speeds, paths, data reveals layers of Earth

  5. D. A Journey to the Center of the Earth Temperature… increases And Pressure… a force pushing on a surface or area… increases as you go deeper inside Earth

  6. D. A Journey to the Center of the Earth • 3 Layers to the Earth • Crust • Mantle • Core • outer core • inner core

  7. 1. The Crust • Outer most layer • Thinnest layer -- ranging from 5 - 40 km • Continental crust granite • Oceanic crust basalt

  8. 2. The Mantle • Located beneath the crust • Is about 2,900 km wide • A layer of hot rock • Has 3 layers • Lithosphere • means stone • rigid layer • Asthenosphere • means weak • Soft , tar-like • Lower Mantle • solid

  9. 3. The Core is divided into 2 sections: a). Outer Core • Beneath the mantle • molten iron and nickel • a thick liquid • movements create Earth’s magnetic field

  10. b). Inner Core • Beneath Outer Core • A dense ball of solid iron and nickel

  11. E. Earth’s Magnetic Field • Earth’s outer core spins around a solid inner core of molten iron that creates a magnetic field.