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History of Life on Earth

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History of Life on Earth By: Mr. Kauffman Outline Early History of Earth Evidence of Early Life How Old is Something Fossil Record History of Life on Earth Where Did ... – PowerPoint PPT presentation

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Title: History of Life on Earth


1
History of Life on Earth
2
Outline
  • Early History of Earth
  • Evidence of Early Life
  • How Old is Something
  • Fossil Record
  • History of Life on Earth
  • Where Did Life Come From

3
Early History of Earth
  • How old is the Earth?
  • 4.6 billion years old (4,600,000,000)
  • How do scientists explain how the Earth formed?
  • Big Bang Theory
  • Large explosion 10-15 billion years ago
  • Created the universe

4
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5
Expanding Universe
6
Early History of Earth
  • What was Earth like at first?
  • Very hot constant volcanic eruptions and
    meteorite impacts
  • Atmosphere consisting of Ammonia, Methane, Water
    Vapor, Carbon Dioxide, and Nitrogen
  • What is missing?
  • Oxygen

7
Evidence of Early Life
  • Fossil remains or imprints of long dead
    organisms preserved in the Earths surface
  • most are found in sedimentary rock (mud from
    dried up waters)
  • 2 basic types of fossils
  • 1. Imprint footprints or plant
    impressions
  • 2. Remains bones or teeth

8
Evidence of Early Life
9
How Old is Something
  • How do scientists determine the age of a fossil?
  • Relative Dating examine how deep the fossil is
    buried
  • the deeper it is buried, the older it is
  • Radiometric Dating study radioactive elements
    found in the fossil and rocks around it

10
How Old is Something
11
Fossil Record
  • Collection of all types of fossilized organisms
    that have been discovered
  • Millions of species of fossilized organisms have
    been discovered
  • Estimated to be about 2 of all species that have
    lived on Earth
  • New species are still being found
  • 2 patterns can be observed
  • Fossils appear in order
  • Not random, not mixed together
  • Example dont find human remains with dinosaur
    remains
  • As we progress through time, fossils look more
    and more like modern day creatures

12
Fossil Record
13
Fossil Record
14
Fossil Record
15
Fossil Record
16
Fossil Record
17
History of Life on Earth
  • Time frames are divided into periods
  • Jurassic is one example
  • Each period has certain characteristics specific
    to it
  • What it looks like
  • What lives there
  • Factors that determine what life could be found
    on Earth
  • Amount of oxygen
  • Continental shift
  • Meteors
  • Volcanoes
  • Climate

18
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19
Meteorite Craters
¾ of a mile in diameter
111 miles in diameter
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