1. 2/23 & 2/24 - 7 th Grade Agenda Collect HW: Reading & Notetaking p. 145 & 146 Geological Time Scale Brain Pop: Carbon Dating, Fossils Class work: Science Fair Worksheet #4 Video: Walking w/ Monsters before Dinosaurs Text Book Reading: 286 – 288 HW: Reading & Notetaking p. 148 & 149 Reminder: Science Fair Project due 2/25 & 2/26 6 Points Extra Credit: Bring a signed grade printout from home due 3/10 & 3/11

2. How much do you owe? US Government Debt City & State Debt Future Medicare & Social Security Debt About $348,000 per person including you (www.usdebtclock.org)

3. Who do we owe the money to? China Japan Great Britain Middle Eastern Countries Banks

4. What are they going to do if we don’t pay it back? ????

5. Science Fair Project due 2/25 & 2/26 (50 Points)

9. If Geologic time went by in a single day, when did humans first appear? Humans first appear one second before midnight

10. Geological Time Scale Paleozoic: Paleo means ancient or early Mesozoic: Meso means middle Cenozoic: Ceno means recent

11. When was the earth created? Earth was formed about 4.6 billion years ago

12. What happened during Precambrian Time? Earth was formed about 4.6 billion years ago Earliest forms of life began about 3.5 billion years ago. They were single celled organism similar to bacteria About 2.5 billion years ago, organisms started to use the process of photosynthesis. This increased the amount of oxygen in the atmosphere.

13. Development of Atmosphere

14. When did life began on earth? Earliest forms of life began about 3.5 billion years ago. They were single celled organism similar to bacteria

15. What happened during Paleozoic Era 544 – 245 Million Years ago? Cambrian Explosion: At the beginning of the Paleozoic Era, a great number of different kinds of organisms evolved.

16. Cambrian Period – Explosion of Life in the sea (544 Million Years ago)

17. Devonian Period – Animals invade the land (408 Million Years Ago)

18. Permian Period (286 Million Years Ago)

19. End of the Permian Period, there was a mass extinction – (245 Million years ago) 95% of life in the oceans disappeared What do you think might have cause the mass extinction?

20. Mesozoic Era – Triassic, Jurassic Cretaceous Period (245 – 66 Million Years ago)

21. End of Cretaceous Period, there was another mass extinction (66 Million years ago) Where did the asteroid hit? Asteroid hit near southeastern Mexico (Yucatan Peninsula) When the asteroid hit Earth, the impart threw huge amount of dust and water vapor into the atmosphere

22. Which animal is the closest living relative of Dinosaurs? Birds are considered to be closest relatives of dinosaurs

23. Cenozoic Era – Age of Mammals (65 Million Years to Present)