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Earth formed 4.6 billion years ago when dust and rock particles were pulled together by gravity.
One of the earliest signs of life were single celled bacteria. They appeared about 4 billion years ago. And will help make life on Earth.
Stromatolites are layered mounds that were made from cyanobacteria a single celled microbe that could photosynthesize. Fossilized stromatolites hold records of early life.
Banded iron formations are 1.8 to 2.5 billion years old. They are made of different kinds of iron that sank to the bottom of the early sea and layered.
Multicellular life formed about 600 million years ago. They will be the ones to start life on earth.
The cambrian explosion was about 541 million years ago. It was the most major sea animal creation. It made most of today's modern sea animals.