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Earth’s History
• How the earth works.
• How the earth has changed over time.
• Earth timeline activity.
• California geology.
Earth Structure
How the Earth Works:Plate Tectonics
The Earth’s Plates
Themes for Today
• The earth is very old.
• The earth is always changing.
Ages to Note
• 14 billion years - age of universe
• 4.5 billion years - age of earth
• 3.5 billion years - oldest know life on earth
• 544 million years - explosion of life
• 65 million years - dinosaur extinction
• 1.5 million years - first homo sapiens
Geologic Time Scale
Cambrian540 Ma
Permian270 Ma
Cretaceous 60 Ma
Present
North America: Plate Tectonics at Work
Timeline Activity
• Divide into groups of 2.
• Collect 4.5m of adding tape.
• Using the worksheet provided, measure out each time.
• Note that each time is the time from the present, not the previous time.
• Have fun!!