Quizlet Chemistry - Earth

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  1. Atmostphere: A layer of gasses
  2. Atmostphere contains these gases: Nitrogen 80%, Oxygen 20%, Carbon Dioxide
  3. Atmostphere contains tiny amounts of what?: Noble Gases
  4. Core: Centre of eart (2 layers)
  5. Crust: Top layer of earth
  6. Density of Crust under continents: Less dense (granite)
  7. Density of Crust under oceans: More dense (basalt)
  8. Depth of Crust under continents: 35km
  9. Depth of Crust under oceans: 5km
  10. Earth's surface slit up into these: Tectonic plates
  11. Evidence of structure of earth: Study of rocks, mines, volcanoes, earthquakes (seismic waves), and magnetic field.
  12. Group for Noble Gases: Group 0
  13. How did we get oxygen on the earth?: Early life forms could take energy from the sun and produce oxygen (photosynthesis)
  14. How else was water brought to earth?: Icy comets
  15. How were the oceans formed?: Water vapour condensed and fell as rain
  16. Innercore: Densest part of the earth
  17. Lithosphere: Upper Mantle and Earth's Crust
  18. Lower Mantle: Solid rock (more dense)
  19. Mantle: Second layer with two parts
  20. Name the Noble Gases: Helium, Neon, Argon, Krypton, xenon, Radon
  21. Outercore: Made of magnetic materials
  22. Tectonic Plate: Huge sections of the lithosphere that move
  23. Upper Mantle: Magma
  24. Use of argon: The inert atmostphere inside a bulb so the filament doesn't burn away
  25. Use of Helium: Airships and balloons. Low density so floats in air but not flammable.
  26. Use of Neon: When we pass an electricl current through it glows
  27. What did the first volcanoes release?: Carbon dioxidem water vapour and nitrogen gas
  28. What did Wegner first notice?: Continental fit - south america and west africa (coincidence?)
  29. What do we call molecules that exist as single atoms?: Monatomic
  30. What is the mid atlantic ridge?: Lava was spewing out and cooled
  31. What is useful about noble gasses: Not reactive
  32. What may happen where tectonic plates meet?: Volcanoes and tsunamis form, earthquakes may happen
  33. What was the early atmostphere made from?: Carbondioxide, some water vapour, nitrogen, traces of methane and ammonia, no oxygen
  34. What was the scene at the begining of the the earth?: Volcanoes belching fire and smoke
  35. When was the earth created?: 4.5 billion years ago
  36. Why are there convection currents in the earth?: Radioactive decay produces lots of energy
  37. Why do tectonic plates move?: Due to convectionn currents in the mantle
  38. Why the earth's core is hot: Radio active decay of isotopes