Fossils
Earth's History
Animal Ancestors
Times and Dates
Rocks and Layers
100
An organism that has been preserved over time naturally.
What is a fossil?
100
Lava and frequent meteor showers.
What did Earth first look like?
100
Very small bacteria and single celled organisms
What were the first life forms on Earth?
100
4.6 billion years
How old is Earth?
100
The youngest layer of rock is on top and the oldest on the bottom
What does the law of superposition state?
200
Trace fossils.
What are burrows, tracks, and coprolites?
200
Great Oxidation Event
How did oxygen first appear on Earth?
200
Ocean life (crustaceans, mollusks, etc.)
Which group of species evolved fastest?
200
700 million years after Earth's creation
When did life first appear on Earth?
200
Index of rocks that make up Earth
What is a geologic column?
300
Sedimentary rock
Where are fossils usually in?
300
Ozone layer.
What was a layer that appeared when Earth was very young and is essential to life.
300
Early fish/ocean creatures
Who were the earliest vertebrae?
300
65 million years ago.
How long ago did the dinosaurs go extinct?
300
An unconformity
What is a flaw or missing layer of rock in a group of layers?
400
Record of all past fossils.
What is the fossil record?
400
Micro-bacteria
What was the first sign of life on Earth?
400
Humans
Who were the first complex mammal to appear?
400
200,000 to 2.8 million years
When did humans first appear?
400
http://raider.mountunion.edu/~mcnaugma/images/Structures/3L99-4%20I70Roadcut%20denver.jpg They are disturbed.
What do you notice about these rock layers?
500
Fossilized animal dung
What is coprolite?
500
Theia
What hit Earth and caused it to change dramatically?
500
Fish
What is an example of an animal humans evolved from?
500
252-66 million years ago
When was the Mesozoic era?
500
A rock from which intrusion can form.
What is igneous rock?
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