Birth of Earth
What’s the name for the outer layer we live on?
Crust
The eon when Earth was super hot and violent.
Hadean
Tiny ocean life that made oxygen.
Cyanobacteria
Earth’s crust is split into ___.
Plates
Humans appeared about __ million years ago.
2.5 million years ago
Heavy element that sank to Earth’s center.
Iron
The first large bodies of water on Earth.
Ocean
The event when oxygen filled the air.
Great Oxygenation Event
The plates float on top of this layer.
Mantle
The warming of the planet over time.
Climate change
What was early Earth full of?
Molten rock
The eon when the first life appeared.
Archean
The layer that protects us from UV rays.
Ozone layer
The most famous supercontinent.
Pangaea
The spread of waste in land, water, and air.
Pollution
Force that pulled cosmic dust/gas to form Earth.
Gravity
These tiny life forms lived without oxygen.
Anaerobes
What gas became common in the air after the event?
Oxygen
These form when plates push together.
The group of animals that can fly and survived.
Birds
Separated Earth’s layers into core, mantle, crust.
Planetary differentiation
Early life forms were made of how many cells?
One
What type of life started dying because of oxygen?
Anaerobic life
Sudden shaking of the ground.
Earthquake
What caused the dinosaur extinction?
Asteroid