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Transcript

  • 1. Earth's Place In Space
  • 2. Earth's Place In Space
    • Origin Of The Universe
      • Big Bang Theory
      • How our solar system formed
    • Earth's Early Atmosphere
    • Evolution
  • 3. Origin Of The Universe
    • Big Bang Theory
      • Scientists believe that there was a giant explosion around 12-14 billion years ago.
      • Atomic particles from the explosion later formed galaxies, stars, and planets.
  • 4. Supernova
      • 7 Billion years ago, a supernova occurred from one of the first generations of giant stars exploding.
      • A supernova occurs at the end of a stars life, releasing huge amounts of energy.
  • 5. Solar Nebula
      • The energy released from the first generation of stars exploding, produced a solar nebula.
      • A solar nebula is thought to be a spinning cloud of dust and gas.
  • 6. Solar Nebula
    • Gravity caused the spinning could of dust and gas to collapse and condense forming our Sun in the center.
    • The other lumps of matter that formed from the contracting dust and gas became the planets.
  • 7. Earth's Early Atmosphere
    • 4.6 billion years ago, Earth was nothing more than a molten ball of rock surrounded by an atmosphere of hydrogen and helium.
    • As the Earth cooled
    • enough to form a
    • solid crust, it was
    • covered with active
    • volcanoes.
  • 8. Earth's Early Atmosphere
    • These volcanoes spewed out gasses, like water vapor, carbon dioxide, and ammonia forming Earth's early atmosphere.
  • 9. Earth's Early Atmosphere
    • Very little oxygen
    • No ozone layer
      • Early life could only survive in the ocean (UV radiation)
    • Early organisms used energy from the Sun for photosynthesis.
      • Conversion of the suns energy into chemical energy by living organisms.
      • Oxygen was released as a byproduct.
  • 10. Earth's Early Atmosphere
    • As oxygen increased, the ozone layer was formed protecting Earth from harmful radiation.
    • This allowed for plant life to evolve and made it possible for the evolution of animal life on land.
  • 11. Evolution
    • Precambrian: Multicelled organisms
    • Paleozoic: Reptiles
      • Ice Age
    • Mesozoic: Dinosaurs/Mammals
    • Cenozoic: Early humans/Modern Humans

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