4steps from the big bang
35things can go into it
air
NaturalMineral
Earth's air only became rich in oxygen about 2.4 billion years ago, thanks to microbes in the sea.
First appeared2.4 billion years ago
Made Of
Everything is made of something.← What it takes
What it leads to →
Needs
Goes into
Earth's air only became rich in oxygen about 2.4 billion years ago, thanks to microbes in the sea.
From the big bang to air
The most direct chain from the start of the universe, following what things are made from and, for living things, what they evolved from. Each step shows when it first appeared.
big bang13.8 bn yrs ago
Hhydrogen13.8 bn yrs ago
star13.6 bn yrs ago
Ooxygen13.6 bn yrs ago
air2.4 bn yrs ago