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History of the Earth Timeline
Formation of the Earth Formation of the Earth's
4.5 Billion years ago the Earths'
Crust
atmosphere was 98% CO2 and 3.8 Billion years ago the Earths'
that the Earths global temperature crust solidifies. The oldest
was much higher than it is today. rocks that are found on Earth
were formed in this period.
First Life on Earth
3.5 Billions years ago the first
living organisms appear- single
celled without a nucleus these
are called prokaryotes.…read more

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History of the Earth Timeline
Photosynthesis Begins Eukaryotes form
3 Billion years ago the blue-green 1.5 Billion years ago slightly more
algae begin to photosynthesis, complicated single-celled
causing a release in oxygen that organisms (Eukaryotes) begin to
slowly start to strengthen the form.
ozone layer and change the
atmosphere.
Fish and Plants appear
500 million years ago fish and
plants start to appear, in
addition to the stratospheric
ozone layer developing.…read more

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History of the Earth Timeline
Dinosaurs Appear
300 million years ago the reptiles ,
known as dinosaurs, begin to
appear.
Mammals Appear
200 million years ago mammals
began to develop.…read more

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History of the Earth Timeline
Dinosaurs Become Extinct
65 million years ago dinosaurs
become extinct probably because of
an asteroid that hit the earth.
Mammals take over.
Two Legs
4 million years ago two legged
mammals began to develop.…read more

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The Origins of Life on Earth
· Since there is no concrete evidence of
how life on Earth specifically began, it is
very hard to tell. Although scientists
believe that it was 3-4 billion years ago
when life on Earth first began.…read more

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