1. Earth’s History

2. How do we know that the interior of the earth has layers?
Write down your answer in your notebook.

3. How do we know that the crust is made up of tectonic plates?
Write down your answer in your notebook.

4. How old is the Earth?

5. If all of Earth’s History happened in 1 year…

6. Mini-Quiz and Guided Notes
Rank these in order of appearance on Earth dinosaurs algae (single-celled) aquatic animals plants birds

7. So how did we figure out when things happened?

8. Mini-Quiz and Guided Notes
Match each type of rock in the Grand Canyon with the environment of Northern Arizona/Southern Utah when that sedimentary rock was formed: Sandstone (orangish) Muddy swamp with lots of plants Shale (dark grey) Shallow ocean with lots of shelled-animals such as clams, snails, oysters, etc. Limestone (light grey) Dry desert covered with rocks

9. Click on slide 1 to start there.
So how exactly to fossils tell time?
Click on the link below or the picture to start an interactive experience which shows how we know about the timeline of Earth’s history.
Click on slide 1 to start there.
rations/tours/geotime/gtpage1.html

10. Mini-Quiz and Guided Notes
Label the oldest rock and the youngest rock on this diagram:

11. Mini-Quiz and Guided Notes
The law of ________________ says that the oldest rock layers formed first, and will be at the bottom of the stack of rock. Supernovas Supernatural Superposition Supermen

12. Mini-Quiz and Guided Notes
brachiopods
According to this fossil evidence, which layer(s) of rock was formed after brachiopods appeared, but before ammonites existed? (choose all that apply) dark orange green red lavendar
ammonites

13. Mini-Quiz and Guided Notes
____________________, which analyzes the chemicals found within a rock sample, tells us the actual dates of when rock was formed. Radioactive Decay Radiometric Dating Radical Dating

14. Mini-Quiz and Guided Notes
Which of these encompasses the greatest amount of time? Eon Era Period Year

15. There’s one more trick to unraveling Earth’s history…
Uniformitarianism
“Earth processes happen today in the same time scale as they did billions of years ago.”
It has always taken millions of years to form new rock or to weather existing rock.
Can you label each type of rock pictured?

16. There’s one more trick to unraveling Earth’s history…
Uniformitarianism
Processes that shaped North America were the same processes that Shaped Africa. In fact, we find some of the same fossils in the same layers.
These are called “index fossils” because we know exactly when those species were alive on Earth.

17. There’s one more trick to unraveling Earth’s history…

18. And now… a scar-your-brain-song

19.
Click here for a cool interactive game if you have time…