The History of Life on Earth

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The History of Life on Earth

• Chapter 8

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• Scientists look for clues to help them
  reconstruct what happened in the past.
• Age of Fossils
• Relative dating ordering fossils to
• Absolute dating the method use to measure the
  ratio of unstable atoms to stable atoms, which
  helps scientist determine the of a fossil.
• The Geological time scale- the calendar scientist
  use to outline the history of life on earth

estimate
their age
approximate
age
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• Pangaea- a single landmass of the earth

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• Plate Tectonics- forces that drive the movement
  of of Earth's crust around the surface of the
  planet

pieces
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• What are some possible forces that cause the
  Earths crust to move?

Form due to volcanic eruptions and earthquakes
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Shared characteristic of Primates
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• Define Hominid
• Describe what is known about the difference
  between hominids

Humans and their humanlike ancestors
Both have an opposable thumb
pelvis
differences
Longer arms