Untitled Slide

Earth is Born

Untitled Slide

• 4.5 billion years ago
• Formed from cloud of dust and rock
• Rocks collided then formed gravity over time.
• Planet collides with Earth chunks form moon.
• Cooled, solidified, allowing water to exist on surface [1]

The Great Oxidation

Untitled Slide

• Bacteria harnessed sunlight.
• Carbon dioxide + water = sugar. [2]
• Oxygen may have caused 1st "Snowball Earth".
• Oxygen stripped green house gases.
• 2.3 billion years ago. [3]

The First Birds

Untitled Slide

• Birds evolved from feathered dinosaurs.
• Archaeopteryx, famous early bird.
• Archaeopteryx is 150 million years old
• Xiaotingia and Aurormis found in China.
• Started 160 million years ago.
• Came from theropod dinosaurs [4]

Untitled Slide

• www.bbc.co.uk
• www.bbc.com
• www.nytimes.com
• www.sciencemag.org