What was the atmosphere 4500 million years ago?

Answer 1

Well, the Universe has only existed for about 14.7 billion years, so the first 433 billion years were uninteresting. Then the Earth only formed about 4 - 5 billion years ago, so the atmosphere was very tenuous until that time.

Answer 2

It was mainly made up of four gases: Water vapour, Oxygen, Carbon dioxide and nitrogen. The water vapour and carbon dioixde came from volcanoes erupting around 300 million years ago (300,000,000).there you go george you lazy fat chicken wing. hey hey hey kyle guess what your mums FAT!!!!!!!

Answer 3

That depends how many millions of years you go back in time. One or two million years ago, it was probably quite similar to today's atmosphere. On the other hand, 3 billion years or so there was hardly any oxygen - until living beings started producing oxygen, resulting in an environmental catastrophe (the "Oxygen Catastrophe") which almost killed all life on Earth! If you go back even further in time, there was an atmosphere that consisted mainly of hydrogen. For more details, check the Wikipedia article "Atmosphere of Earth".

Answer 4

How much oxygen was 25.000years ago?Please tell me in precents.

Answer 5

The Earth likely looked very different 200 million years ago. The Earth likely had far more vegetation and animal life.

Answer 6

it was an atmosphere made up of only carbon dioxide

Answer 7

A million years ago it was virtually identical to now, except for a lower slightly lower CO2.

Answer 8

Peevish.