1. DQ: What do you think Earth was like during the Cambrian Era?
Tuesday, January 6th, 2015
Materials:
Pencil
Notebook
Agenda
Agenda:
Cambrian Era Notes
Reading
DO: Today we will Learn about Earth history starting with the pre-Cambrian era.
DQ: What do you think Earth was like during the Cambrian Era?

2. Go to Google Drive (Upload)
Go to X Students7th Grade  7C- Merritt Class period
Upload the “Geologic Time Scale Form”
Start Editing
You may also download & save it to your H drive
** You will be typing notes with this document for the next two weeks!

5. Vocab:
- Eon: a major division of geological time, subdivided into eras. A unit of time equal to a billion years.
- Era: a long and distinct period of history with a particular feature or characteristic. Divided into periods
- Period: Large interval of time that is meaningful because of it’s characteristics
Sequential Time: the order of events in a sequence (ex: you woke up before your brushed your teeth.)
Numerical Time: The actual time that events occurred. (Ex: I woke up at 5:30 & brushed my teeth at 5:33.)

6. The Archaen Eon Crust cools & Plate tectonics is established
Atmosphere composed of nitrogen, hydrogen, carbon, but very little oxygen
The first life appears and forming the earliest fossils
Complex chemical reactions change carbon molecules into earliest life forms
First photosynthetic organisms produce oxygen

7. Proterozoic Eon Protero= first Zoon= life in Greek
First multicellular animals by end of interval
Larger land masses form from the accretion of smaller ones
4 major mountain-building episodes

8. Continents begin to erode into oceans creating marine environments where life could diversify
Increasing oxygen in the atmosphere caused some life forms to go extinct, while allowing others to flourish
Oldest known glaciations

9. Paleozoic Era & Cambrian Period
mya
Cambrian Explosion of life forms
Skeletonized animals (exoskeletons)
Early animal diversification
Diversification of trilobites
Burgess Shale fauna (fossils of soft bodied animals)
Warming climates
Plate tectonics

12. Trilobite diversification

14. https://www.youtube.com/watch?v=xR-yMiyquG4 (Whole Video)
Evolution of life in Cambrian (10 min)
Gentle Giants of Cambrian (5 min)
VIEW
“First Life with David Attenborough- The Explosion of Life” 3 min. Disc. Ed.
(Whole Video)

15. Timeline project: