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How old is the Earth?
• 4.6 billion years!• 4,600,000,000• Divided into “eras”:
– Precambrian– Paleozoic– Mesozoic– Cenozoic
How big was a a Sauroposeidon?
A scale timeline
• To appreciate the times involved in Earth’s history, we will make two scale timelines
• A set distance on the timeline represents the same amount of time (E.g. 1 cm = 1 year)
• Example: If this line represents your K-12 school career, where would you be now?
K 12
K 1 2 3 4 5 6 7 8 9 10 11 12
A scale timeline
• To appreciate the times involved in Earth’s history, we will make two scale timelines
• A set distance on the timeline represents the same amount of time (E.g. 1 cm = 1 year)
• Example: If this line represents your K-12 school career, where would you be now?
Scale Timeline of Earth’s HistoryPart I: Outdoor Timeline
• How old is Earth?• 4,600,000,000 years old
(4.6 billion years)
• Today’s time line scale: 1m = 100 million years
• 4.6 billion years = 46 meters
Ground Rules
• We stay together - no stragglers!• When I talk, you listen• Stay with your table partner and make
decisions as a pair
Scale Timeline of Earth’s HistoryPart II: Paper Timeline
• Today, you will create a scale timeline of Earth’s history on a long sheet of adding machine paper
• Scale: 1 inch = 100,000,000 years
• 4.6 billion years = 46 inches• E.g. Mr. Inman’s mother was born
1,625,000,000 years ago. Where would this be on the time line?
Scale Timeline of Earth’s HistoryPart II: Paper Timeline
You may use:• Meter sticks (even though we’re using inches)• Decimal inch rulers• Your textbooks• Copies from other textbooks
• The internet• You may compare your timeline to my sample,
but you can’t take a pencil there when you go!
Scale Timeline of Earth’s HistoryPart II: Paper Timeline
To clean up:• Return
– Meter sticks (even though we’re using inches)– Decimal inch rulers– Your textbooks– Copies from other textbooks
• Leave the computers running and open, but shut down the internet
• One member of each pair will keep the timeline until tomorrow
• Go back to original seats