Time After Time

Do it!

• Check with an adult first! Then unroll the entire roll down the hallway or sidewalk.
• If you have a roll with at least 400 squares, each square represents over 12 million years.
• Write "5 billion years ago - earth and other planets formed" on a sticky note and put it at the beginning of the roll.
• Count up the roll 104 squares. Write "Earth’s crust becomes solid," and place it on the square.
• Count up 16 more squares. You are now on square 120. Write "First life appears in oceans."
• Count up 20 squares. You are now on square 140. Write "Photosynthesis begins in oceans."
• Count up 108 squares. You are now on square 248. Write "First cells with nuclei in oceans - volcanic base deposit of Grand Canyon."
• Count up 100 squares. You are now on square 348. Write "First multi-cellular organisms appear."
• Count up 11 squares. You are now on square 359. Write "First land plants appear."
• Count up 21 squares. You are now on square 380. Write "Mass extinction of 99% of all life. Age of Dinosaurs begins."
• Count up 8 squares. You are now on square 388. Write "Supercontinent breaks up, continents drift apart."
• Count up 6 squares. You are now on square 394. Write "Age of Dinosaurs ends. Mass extinction of 70% of all living things."
• Count up 5 squares. You are now on square 399. Write "Colorado River begins cutting the Grand Canyon."
• Count up 1 square. Yes, you are on the last square. Write "First proto-humans appear in Africa."
• Measure 1 mm from the end. Write "First modern humans appear."
• If you can fit a note in put one .5 mm from the end. Write "Lake Bonneville exists."
• Measure .1 mm from the end. Write "Recorded history begins."