Earth time line

Luis Angel Prieto Lopez. 3B

Earth´s timeline

4600 mya –earth is born

400 mya – The first land plants evolved

3850 mya – First live forms

Dust left over from the birth of the sun clumped together to form planet Earth. The other planets in our solar system were also formed in this way at about the same time.

700 mya – The first animals evolved.

This served as a protective barrier to the harmful rays coming from space and which allowed plants to colonise the land.

It was very simple single-celled organisms. Exactly how life first arose is a mystery.

These were simple single-celled animals.

4400 mya – First oceans formed

350 mya – The first land vertebrates evolved.

1500 mya – Oxygen began to accumulate

530 mya – The first vertebrates (fish) evolved.

Water vapour was released into the Earth’s atmosphere by volcanism. It then cooled, fell back down as rain, and formed the Earth’s first oceans.

The first to venture onto the land were primitive amphibians, and reptiles evolved soon afterwards

Oxygen is made by cyanobacteria (blue-green algae) as a product of photosynthesis.

It was during this time that the early chordates developed the skull and the vertebral column.

225 mya – The first dinosaurs evolved from lizards.

130,000 years ago (0.13 mya) – Modern humans evolved.

They were a separate group of reptiles with a distinct upright posture not found in lizards

Homo sapiens evolved in Africa from earlier humans. They left Africa around 35,000 years ago and spread around the globe. Human evolution is still pretty mysterious, due to gaps in the fossil record.

65 mya – The dinosaurs went extinct.

The dinosaurs, and many other species with them, were wiped out by the after-effects of a meteorite impact, or perhaps several impacts.

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