During the early earth, when photosynthesis has not yet evolved, there were only negligible amounts of free oxygen in the atmosphere. It was said that the Earth's atmosphere had no free oxygen then. This is about 3.5 billion years ago.
Answer:
Humans impact the physical environment in many ways like overpopulation, pollution, burning fossil fuels, and deforestation.
Answer:
true..........................
It's an air mass that develops over surface of a large body of water
I think it would be B) northwest
That shows the most iron ore deposits which would mean that is probably where the most iron mines would be.
