Evidence suggests that originally the Earth's atmosphere contained a large amount of carbon dioxide and almost no oxygen. Our atmosphere is different today: it contains a large amount of oxygen, which is good, since we need it to breathe
What caused this atmospheric change?
A)
Global warming
B)
A meteor impact
C) Photosynthetic organisms like cyanobacteria taking in carbon dioxide and
releasing oxygen
D) Photosynthetic organisms like cyanobacteria taking in oxygen and
releasing carbon dioxide

How do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.