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Greeley [361]
3 years ago
14

Early Earth was largely anoxic with very little oxygen present in the atmosphere. However, approximately 2 billion years ago, a

rise in atmospheric oxygen concentration was recorded in the geological record. This event, known as the great oxygenation event (GOE), was caused by small microorganisms (cyanobacteria) that likely carried out the process of ____________________ .
Chemistry
1 answer:
blagie [28]3 years ago
8 0

Answer:

Photosynthesis

Explanation:

Cyanobacteria were the first prokaryotic organisms capable of oxygen-evolving complex. Photosynthesis needs an electron source, in this case water (H2O). By photo-oxidation of the water, oxygen (O2) is released (and hydrogen taken).

This led to the accumulation of oxygen in the atmosphere where it got to similar concentrations as in these days.  

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7 0
3 years ago
Predict the bond angle in metgane using vsepr theory
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How does energy play a role in different rock types forming? I had this question another time in my test and it's asking the sam
Virty [35]

Answer:

Yes

Explanation:

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3 years ago
How can the system restore equilibrium when disturbed (forward or reverse)
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7 0
3 years ago
Read 2 more answers
A saline solution contains 1.6 % NaCl by mass.How much NaCl is present in 57.2 g of this solution?
nekit [7.7K]

Answer:

0.92 g

Explanation:

Given data:

Percentage of NaCl = 1.6%

Amount of NaCl present in 57.2 g = ?

Solution:

1.6% of 57.2 g NaCl:

1.6/100× 57.2 g

0.92 g

So in 57.2 g 1.6% of NaCl is 0.92 g.

6 0
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