1. Aim: How did Earth evolve to support life? How did life evolve?
Do Now:
Compare relative dating to absolute dating.
-Tell me what they have in common and how they differ.

2. I. Evolving Atmosphere
Earliest Earth gasses came from the outgassing of volcanoes.
Consist mainly of water vapor (H2O), carbon dioxide (CO2) and nitrogen (N)
- Oxygen that we breathe was produced by plants during Photosynthesis.

3. II. Evolving Biosphere
Evolution is the gradual change seen in organisms over time
these changes are called variations
more favorable variations are kept through breeding, and less favorable traits are lost. Darwin’s Theory of Natural Selection

4. III. Evolution and Fossils
The fossils record shows us that many of the organisms that lived on Earth are now extinct.
Fossils help show how organisms have changed over time.

5. Closest extinct human relative (Neanderthals)
Closest extinct human relative (Neanderthals). We have DNA from this ancestor
You and Me
“Lucy”
Walking completely upright
“handy-man”

6. IV. Evolving Lithosphere
Rocks are the oldest things that are on our planet. The oldest rocks are found in Canada date to 4.28 Billion years old ( Faux-Amphibolites )
- Rocks are forever changing due to the Rock cycle
- Fossils are only found in Sedimentary rocks