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

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