This is quite a controversial topic. After an experiment, scientists believe that the early earth had an atmosphere that contained amino acids, which gave a purplish-pink tinge to the atmosphere and helped life grow. What is most widely accepted is that the early earth was a fiery hot ball made of molten magma.
As meteors hit its surface, the lighter metals floated up and the heavier elements sunk down. This created the first land. Volcanoes that were erupting CO2 created ideal conditions for plant life, that absorbed only CO2, to thrive. Comets that crashed down released water, letting plants absorb its minerals and grow ever more healthily. Life began to grow this way. The land began to cool down.
The plants grew to large numbers, and began to release more oxygen than the amount of CO2 they could take in. Gradually, these plants began to die out. However, with the amount of oxygen they released, the plants lay a foundation for life.
---- A Budding Cryptozoologist
This question cannot be answered without:
1. A specific time period, or
2. A description that covers the entire period of its existence.
The surface of early earth was mostly molten and volcanic. The atmosphere was hot and highly toxic.
no
No. The early Earth's atmosphere contained a lot of ammonia, for example.
There is not much atmosphere on earth
Unbreathable. Lots of CO2 and methane and hydrogen & no oxygen. Nitrogen was about the same.
dioxide
oxygen
photosynthesis
No! Stromatolites converted the toxic atmosphere into a breathable one.
Not a lot! Early life transformed the atmosphere; removing much of the carbon dioxide, so without life Earth would probably have an atmosphere and environment like Venus.
No. The moon does not have an atmosphere.
outgassing from rocks