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Inside the earth


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Inside the earth

  1. 1. Inside the EarthLooking at the Earth’s layers
  2. 2. Composition (What it is made of)• Crust• Mantle• Core
  3. 3. The Crust• Outer layer• 5-100 km thick• 2 types of crust – Oceanic (very dense, made of basalt) – Continental (less dense, made of granite)
  4. 4. Oceanic and Continental Crust
  5. 5. The Mantle• Middle layer• Very thick layer( 2900 km)• Rock on the top• Part of the lithosphere
  6. 6. The Core• Made mostly of iron• Very hot ( 7000 °C)• Outer core is liquid Thickness is about 2221km• Inner core is solid. Thickness is about 1255 km radius
  7. 7. Earth’s Layers• How are the earth’s layers similar to an egg? • Egg white=mantle • Shell=crust • Yolk=core
  8. 8. Physical Structure of the Earth (5 Layers)• Lithosphere- rigid outer layer (crust)• Asthenosphere- solid rock that flows slowly (like hot asphalt)• Mesosphere- middle layer• Outer Core- liquid layer• Inner Core- solid, very dense
  9. 9. Earth’s Spheres
  10. 10. The names of the four spheres are derived from theGreek words for stone (litho), air (atmo), water (hydro),and life (bio). Atmosphere The atmosphere is the body Lithosphere of air which surrounds our The lithosphere is planet. the solid, rocky crust The air of our planet is 79% covering entire nitrogen and just under 21% planet. oxygen; the small amount remaining is composed of carbon dioxide and other gasses.
  11. 11. Tectonic Plates• Earth’s crust is broken into about 19 piecesThese plates move on top of theasthenosphere