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Formation of the Earth and the Iron Catastrophe

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Elsa A.

on 25 November 2013

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Transcript of Formation of the Earth and the Iron Catastrophe

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Formation of Earth Timeline
Formation of the Earth
4.57 billion years ago
During this time Earth formed from a giant cloud of gas. This is the start of the planet Earth.
Asteroids and Comets Hit the Earth
3.9 billion years ago
Asteroids and comets hit the Earth. These astroids and comets came down with liquid water.
First Life Forms
3.5 billion years ago
Rock formations calles stromatolites had made life. These were single celled and the first life forms. They used photosynthesis and gave off oxygen to the water and the air.
Formation of Earth's Oceans and Crust
4 billion years ago
With the Earth cooled crust so the water stayed and formed oceans. The timing of the crust being cooling and the oceans forming is pretty unusual.
Permian Extinction
445 million years ago
Acid rain felt and vegetation died and animals died. The things in the ocean also were harmed. Algae sucked up oxygen from the water. And methane caused heat to be trapped. Most animals went extinct during this time.
The Moon Is Formed
About 4.50 billion years ago
Theia and Earth collided and pieces of both planets broke off and either orbited Earth or became part of Earth. Later the broken off pieces with the help of gravity formed our Moon.
Ancestors of Algae
2.5 billion years ago
The first algae was called cyanobacteria. Which is a blue-green algae.
Evolution of Cells
2 billion years ago
Life on Earth was limited to bacteria life until around 2 billion years ago. Over time the bacteria wasn't able to survive on its own.
End of "Snowball" Earth
Earlier than 650 million years ago
Volcanoes came out from under the snow. The volcanoes got rid of the snow and the Earth kept evolving into the Earth we know today.
"Snowball" Earth
Earlier than 650 million years ago
During this time Earth froze over. Because of all of the snow the sun reflected off the Earth. This made the snow hard to melt.
Cambrian Explosion
550 million years ago
During this time complex animals came out of nowhere. There is no real reason for how those animals got there. But scientists think that the oxygen and environment changes could have played a role.
Dinosaurs
165 million years ago
Dinosaurs were on the Earth for 150 million years. They spread out to every continent.
Iron Catastrophe
4.52 billion years ago
Iron sank to the center of the Earth. The Earth separated into layers. That is why Earth has layers.
Theia Hits Earth
4.50 billion years ago
When Earth was finishing seperating the layers a plant named Theia hit Earth. This tilted the Earth and took off pieces of the Earth that flew off into space and orbited the Earth.
Because of the heat Theia had when hitting the Earth the crust was melted. Earth begin to cool. This created a magma ocean.
Pangaea
200 million years ago
Supercontinents on Earth, formed about 270 million years ago and broke apart about 200 million years ago. This is way we have continents on Earth.
Atmosphere
4.40 billion years ago

The new crusted Earth begins to get a thick atmosphere. This early atmosphere had around 250 times as much pressure as our current atmosphere at the surface.
Humans
2.5 million years ago
Homo is the genus of great apes that includes modern humans and species closely related to them. Homo sapiens also known as modern humans is the only surviving species in the genus, all others having become extinct.
Age of Reptiles
350 million years ago-today
It was a period of time that reptiles were dominant on Earth. Reptiles outdated the dinosaurs. Which makes sense because reptiles are still around today.
Age of Mammals
65 million years ago-today
When the continents moved, climates changed, and mammals evolved. When the dinosaurs became extinct the mammals began to expand in grow in population.
Magma Ocean
4.5 billion years ago
Full transcript