The mississippi river is a physical feature as it was discovered during a time where man weren`t capable of such construction in the earth.
Answer:
they are on tectonic plates
Explanation:
none needed
Answer:
if it hasnt went off in 10000 years then its extent
Explanation:
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.
