3. what two processes contributed to oxygen as earths atmosphere developed?\nvolcanism and…

3. what two processes contributed to oxygen as earths atmosphere developed?\nvolcanism and weathering\nphotosynthesis and volcanism\nphotosynthesis and photolysis\nweathering and rainfall

3. what two processes contributed to oxygen as earths atmosphere developed?\nvolcanism and weathering\nphotosynthesis and volcanism\nphotosynthesis and photolysis\nweathering and rainfall

Answer

Brief Explanations:

Photosynthesis by plants and algae produces oxygen as a by - product. Photolysis, especially in the upper atmosphere, breaks down water vapor and other molecules to release oxygen. Volcanism mainly releases other gases like carbon dioxide, sulfur dioxide etc. Weathering and rainfall do not directly contribute significant amounts of oxygen to the atmosphere.

Answer:

photosynthesis and photolysis