Biology, 30.01.2020 17:57 sofialarrea13

1. what caused dissolved iron to rust and deposit in banded iron formations?

a. outgassing

b. oxygen released by living cyanobacteria

c. huge amounts of rain

d. an asteroid impact

2. which of these was the first source of oxygen in our atmosphere

a. oxygen produced by living things on land

b. oxygen released by volcanoes

c. oxygen released by living cyanobacteria in the ocean which then was released into the atmosphere

d. the original accretion of the earth

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1. what caused dissolved iron to rust and deposit in banded iron formations?

a. outgass...

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