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spin [16.1K]
3 years ago
11

Where did the original atmospheric oxygen come from

Geography
1 answer:
faust18 [17]3 years ago
3 0

The correct answer is - cyanobacteria.

The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.

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What is the Wt% of SiO2 in augite?<br><br> (Ca, Fe, Mg, Na)(Mg,Fe,Al) (Si,Al)2 O6
vaieri [72.5K]

Answer:

The weight% of SiO_2 in augite is 13.16 %.

Explanation:

Atomic mass of calcium = 40 g/mol

Atomic mass of iron = 56 g/mol

Atomic mass of magnesium = 24 g/mol

Atomic mass of sodium = 23 g/mol

Atomic mass of aluminum = 27 g/mol

Atomic mass of silicon = 28 g/mol

Atomic mass of oxygen = 16 g/mol

Mass of SiO_2=28 g/mol+ 2\time 16 g/mol=60 g/mol

Molar mass of the augite (Ca, Fe, Mg, Na)(Mg,Fe,Al)(Si,Al)_2 O_6 = M

M=40 g/mol+2\times 56 g/mol+2\times 24 g/mol+23 g/mol+3\times 27 g/mol+2\times 28 g/mol+6\times 16 g/mol=456 g/mol

Weight% of SiO_2 in augite:

w\%=\frac{60 g/mol}{456 g/mol}\times 100=13.16\%

3 0
3 years ago
Most of Russia's major cities lie in a _____________ climate zone.
marishachu [46]
Temperate climate zone, because big cities don't function well during the arctic winter, nor summer actually

6 0
3 years ago
Which atmospheric layer has the warmest temperature?.
Ainat [17]

ANSWER: thermosphere

7 0
2 years ago
How would an increase in population impact an aquifer
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Question 5 1 pts Which statement about science an religion is NOT true? Science is limited to the natural world, whereas many re
mash [69]

Answer:

The best answer to the question: Which statement about science and religion is NOT true? Would be: No scientists are religious.

Explanation:

Basically that would be the one WRONG statement because it would require for us to know that in truth all scientists are not religious, which is not possible. This statement first arises from the conclusion that science and religion are two completely incompatible areas, and therefore, any person who belongs to one cannot belong to the other. Although it is true that in many ways it seems as if science and religion do not coincide, it must be remembered that it was religious belief, and the desire to explain why the world worked the way it did, what inspired first philosophers like Aristotle, Plato, Saint Augustine, to name a few, to observe and investigate the natural world around them. Also, historically speaking, there have been many men who were religious and who became vital to the development of scientific tenets and fields of study. For all these reasons, the statement that No scientis are religious, is false.

7 0
3 years ago
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