Earth structure 2 m lucente

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Earth structure 2 m lucente

  1. 1. Earth Structure<br />
  2. 2. Four Main Layers<br />Inner core<br />Outer core<br />Mantle<br />Crust<br />
  3. 3. Crust<br />Thinnest Layer<br />Two types of crust :<br />Oceanic: made mostly igneous rock and Basalt. Found under ocean, thin<br />Continental: made mostly of granite. Found under continents, thick<br />
  4. 4. Mantle<br />Located abovethe outer core <br />Below the crust is where the mantle starts<br />Largest Layer<br />80% of Earth’s volume & 68% of Earth’s mass<br />Composed of iron<br />Density, Temperature, And pressure increases the deeper you go into the mantle<br />Lithosphere :upper, solid part of mantle<br />Asthenosphere: under lithosphere, solid rock flows very slowly<br />
  5. 5. Outer Core<br />Surrounds inner core<br />Temp. : 2200c-5000c<br />Iron and Nickel, Liquid<br />
  6. 6. Inner Core<br />Solid, iron and nickel<br />Temp. can reach to 5000c<br />Solid, because of the pressure put on the core<br />Solid core is the source of Earth’s magnetic field<br />
  7. 7. Continental Drift<br />
  8. 8. Alfred Wegener<br />First proposed the theory of continental Drift<br />Continental Drift was his theory that continents were joined together then drifted apart<br />Named Pangaea a supercontinent<br />Theory was rejected because he couldn’t explain which force pushes or pull continents<br />Found pieces of evidence:<br /> Geologic<br /> Climate<br /> Fossil<br />1940s: Technology was developed<br />
  9. 9. Climate<br />evidence in the changing climates during the past.<br />
  10. 10. Geologic <br />evidence in layers of rocks across continents.<br />
  11. 11. Fossil<br />Evidence of fossils are found<br />in certain places<br />
  12. 12. Fossil<br />
  13. 13. Fossil<br />Remains or physical evidence of an organism preserved by geological processes<br />Preserved in sedimentary rock<br />Sediment slows down decay<br />Bones and shells are resistant to decay, more commonly preserved tissue<br />
  14. 14. Examples<br />Fossils in rock<br />Fossils in Amber<br />Petrification<br />Fossils in asphalt<br />Frozen fossil<br />Trace Fossil<br />Mold<br />Cast<br />Index Fossil<br />
  15. 15. Amber<br />Harden tree sap<br /> Bugs, lizard, and frogs<br />
  16. 16. Petrified Fossil<br />A process in which minerals replace organism tissue<br />Types:<br />Space in bone/wood fills up with mineral<br />Organisms are replaced<br /> by minerals<br />
  17. 17. Frozen<br />Cold temperatures slow down decay<br />Many frozen fossil are preserved from last ice age<br />
  18. 18. Fossil in asphalt<br />Wells up in sticky, thick pools<br />Traps and preserves fossil in asphalt<br />
  19. 19. Trace Fossil<br />Naturally preserved evidence of animal activity<br />Footprints fill with sediment<br />Shows how big their <br />Footprint was.<br />
  20. 20. Molds And Cast<br />Mold: a cavity in a rock where a plant and animal was buried.<br />Cast: an object created when sediment fills mold and becomes a rock.<br />
  21. 21. Index Fossil<br />Fossils of organisms that lived during a relatively short, well-defined geologic time span.<br />
  22. 22. Geologic Time<br />
  23. 23. Geologic scale<br />Divisions <br />Largest division is epoch<br />Second largest division- periods<br />Third largest division- eras<br />
  24. 24. Eras<br />Three eras:<br />Cenozoic: means “New Life”<br />Mesozoic: means “middle animals”<br />Paleozoic: means "ancient life"<br />
  25. 25. Cenozoic<br />
  26. 26. Mesozoic <br />
  27. 27. Paleozoic <br />

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