Earth’s History The story of a wimpy planet. ( Or is it?) -An example of what a finished “novel” might look like is on slide 12. -Earth’s Timeline material starts on slide 13.

Research Resources: Network Videos: BrainPOP Videos Computer->Students->Abraham->Science Class-> Earth’s History Videos BrainPOP Videos Geologic Time Earth Carbon Dating Extinction Earth in Space Textbook Geologic Time – Page 296 Dinosaur Extinction – Pages 305-308 Finding the Age of Rocks – Pages 309-311 ScienceSaurus Earth’s History – Pages 194-200 Extinction – Page 118 Most came from YouTube

Where did the Earth come from? Space Gas and Dust (from a nebula)

The Earth cooled and we got liquid water and oxygen. If the early Earth was so inhospitable what happened to make life possible on Earth? The Earth cooled and we got liquid water and oxygen.

What are the “chapters” of Earth’s History? There are 4 different types of time periods all based on major events/changes.

What are some changes in Earth’s Atmosphere? More to come.

What are some major events/changes in life on Earth? More to come.

What was the last major change in the story? More to come.

What is the Goldilocks Principle/Effect? More to come.

What are some possibilities for the end of Earth’s story? More to come.

Earth History Story (mr. B’s Version) thank you for sharing Our planet and solar system was built from the remains of an exploded star Scientists determine age through: Relative dating – Placement in layers Absolute dating: Chemical composition Time periods are based on major changes to life The rocks tell the story of how the Earth has changed over time Life has changed Earth: Photosynthesis gave Oxygen New rocks – Limestone, coral, coal Weathering of rocks leads to erosion Humans change the land and climate Periodic space impacts have affected Earth Landscapes and Life

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Earth’s History Timeline Data Teacher’s Recommendation Major Event/Change # Date Distance Earth is Formed 1 4.5 bya 4.5 m Earth’s Crust Solidified 2 3.7 bya 3.7m First Life Appears in Oceans 3 3.5 bya 3.5 m Photosynthesis Begins in Oceans 4 3.25 bya 3.25 m Oceans Contain Significant Amounts of Oxygen 5 2.4 bya 2.4 m First Cells with Nuclei Appear in Oceans 6 1.9 bya 1.9 m First Multicellular Organisms Appear 7 650 mya 65 cm First Land Plants with Inner Vessels 8 500 mya 50 cm Mass Extinction of 99% of all Species 9 250 mya 25 cm Age of Dinosaurs Begins 10 245 mya 24.5 cm Supercontinent Breaking Up; Continents Drift 11 150 mya 15 cm Age of Dinosaur Ends; 70% of Species Extinct 12 65 mya 6.5 cm First Proto-Humans Appear in Africa 13 3.5 mya 3.5 mm First Homo sapiens(Humans) Appear 14 100,000 ya .1 mm Recorded Human History Begins 15 10,000 ya .01 mm/1µm the “start” end. Measure from Measure from the “present day” end. µm= micrometer (A human hair is about 50-100 micrometers thick. A piece of paper is about 150 micrometers thick.)

This is all in the first 30 cm or so.