1. 4,600,000,000 years ago to 57,000,000 years ago 87% of Earth’s History
Precambrian Era
4,600,000,000 years ago to 57,000,000 years ago
87% of Earth’s History

3. The Earth Forms
Earth Making of a Planet (0:1:26 – 0:30:43)

4. 4.6 BYA . 4.5 BYA . 3.9 BYA . A molten Earth forms Temp = 2,000 °F
Surface = Boiling Rock / Lava / Liquid Rock
Length of Day = 6 hrs (3 hrs day & 6 hrs night)
Atmosphere = CO2, N, and H2O(gas)
3.9 BYA
Temp = 170 °F
Surface = cools enough to form crust
Meteors “attack” Earth leaving water droplets behind

5. 3.8 BYA . 3.5 BYA . Water covers Earth’s surface
Hot Spots create volcanic islands
Hot Spot – a weak spot beneath the Earth’s crust where magma comes out.
3.5 BYA
Stromatolites are here! - Colonies of living bacteria that use photosynthesis.
Stromatolites produce O2 (Oxygen)!

6. 1.5 BYA . 0.750 BYA or 750 MYA. Temp = 85 °F Length of Day = 16 hrs
Plate Tectonics Begin!
Causes the continents to move
Super Continent Rodinia forms
0.750 BYA or MYA.
Length of Day = 18 hrs
Volcanoes release large amounts of CO2
CO2 mixes with H2O(gas) to form carbonic acid/acid rain
Co2 + H2O  H2CO3
Rocks Absorb C as acid rain falls ---> removes C from the atomosphere

7. 0.650 BYA or MYA.
Temp = -60 °F!
SNOWBALL EARTH
Ice sheets 10,000 ft. thick
Volcanoes slowly push through ice from hot spots
As ice melts Hydrogen Peroxide is released
0.600 BYA or MYA.
Length of Day = 22 hrs
Hydrogen peroxide breaks down and releases Oxygen
H2O2  H2 + O2
WHY IS THIS IMPORTANT?!?!!!!