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History of Life on Earth

History of Life on Earth

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History of Life on Earth

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  1. History of Life on Earth Evolutionary TIMELINE Ms. Herrera

  2. Earth is 4.6 billions years old • 1 billion= 1000 million • 1 trillion= 1000 billion • How many millions of years old is earth? • 4600 million years

  3. Directions • For each ERA, create drawings that represent the animals featured during that time. • Take your time to draw out animals, plants or bacteria. • Use the book (pages 427 – 440) for samples of pictures.

  4. Vocabulary Extinct- When a species dies out.

  5. Paleontologist- scientists that study fossils.

  6. Fossil- the preserved or mineralized remains or imprint of an organism that lived long ago

  7. How do fossils form? • 1. Death

  8. 2. Decay and burial

  9. 3. Sediment accumulation and mineralization

  10. 4. Uplift and exposure

  11. 5. Discovery and extraction

  12. Fossil samples

  13. Relative dating: • Top layers are younger than bottom layers this also applies to the fossils found within that layer • determining the age of a fossil by comparing its placement with that of fossils in other layers of rock.

  14. Half-life radioactive dating Some of the elements found in rocks are radioactive. Radioactive elements decay at a steady rate. A half life is the time required for half of the radioactive atoms in a sample to decay. Age of a sample can be calculated based on the remaining atoms.

  15. Fossil Record- Provides evidence about the history of life on earth.