What created earth's early atmosphere?

In addition, there were numerous extremely active volcanoes that emitted large volumes of sulfur gas into the atmosphere.

Volcanic activity played a major role in the formation of Earth's early atmosphere by releasing gases like sulfur dioxide, carbon dioxide, water vapor, methane, and ammonia.

Earth's early atmosphere was primarily formed by outgassing from the Earth's interior during volcanic activity. This outgassing released gases such as water vapor, carbon dioxide, nitrogen, and small amounts of other gases. Additionally, cometary impacts and chemical reactions among these gases contributed to the composition of the early atmosphere. Over time, as the Earth cooled and life forms developed, processes such as photosynthesis altered the composition of the atmosphere, leading to the introduction of oxygen and further changes.