(7 th ) Chapter 8-5 Cornell Notes

Chapter 8-5 Key Questions Why is the geologic time scale used to show Earth’s history? What were early Precambrian organisms like? What were the major events of the Paleozoic, Mesozoic, and Cenozoic eras?

Chapter 8-5 Key Terms geologic time scale- era- period- invertebrate- vertebrate- amphibian- reptile- mass extinction- mammal-

Chapter 8-5 Paragraph 1 geologic time scale: record of geologic events + life forms in Earth’s history.

Chapter 8-5 Paragraph 2 starts with Precambrian Time; then divided into eras which contain periods.

Chapter 8-5 Paragraph 3 earliest life forms ~ 3.5 billion years old; probably bacteria-like.

Chapter 8-5 Paragraph 4 Cambrian explosion; Paleozoic Era: many kinds of organisms developed; like invertebrates or without backbones, like jawless fishes = 1 st vertebrates; Devonian Period: animals invade land; amphibians 1 st land animals; Carboniferous Period: small reptiles develop.

Chapter 8-5 Paragraph 5 Permian Period (end of Paleozoic Era) mass extinction (+90%); aka Permian extinction; affected land and sea animals; possible cause: climate change from continental drift; Pangaea forms during Permian Period.

Chapter 8-5 Paragraph 6 Mesozoic Era: aka Age of Reptiles; 1 st dinosaurs appear; and 1 st mammals.

Chapter 8-5 Paragraph 7 Cretaceous Period (end of Mesozoic Era) another mass extinction; probably due to asteroid collision.

Chapter 8-5 Paragraph 8 dinosaur extinction opened pathway for mammals to develop; Earth’s climate cooled causing series of ice ages to develop; beginning new era called Cenozoic with the Quartenary Period.

Question: Which of the following is a result of the movement of tectonic plates and the continents (2 answers)? 1. Change in location. 2. Change in climate. 3. Change in mutation effects. 4. Change in water levels.

The Theory of Plate Tectonics states that: 1. Earth’s plates move quickly much like the rotation of the planets. 2. Earth’s plates move slowly each year traveling in various directions. 3. Earth’s plates move slowly in one direction: counter-clockwise.

Performance Task : Please turn to your partner and describe the difference between a “continent and a tectonic plate”.