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Which describes oxygen content as Earth evolved over time?
Rena Swain
Oxygen levels stay above 15 percent starting 200 million years ago
Rena Swain
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What layer in the Earth's atmosphere holds the highest oxygen content?
Stratosphere
What best describes the earth's atmosphere?
mostly nitrogen with 21% oxygen
What effects does oxygen have on the earths atmosphere?
Without its oxygen content the Earth's atmosphere would be composed almost entirely of nitrogen and would be chemically inert; oxygen causes the atmosphere to be chemically active (and breathable by humans).
The time in which life first evolved on Earth was the?
eff the time in wich life first evolved on earth!!
Is the air you breathe now the same air since creation?
Creation of what, the earth? There was no atmosphere at creation. No air. The oxygen we breath today was created by living plants that populated the earth long before we evolved
Is the oxygen in the Earth's atmosphere diminishing?
No it isn't. We still have about 21% oxygen content in the atmosphere.
Before photosynthesis evolved was oxygen rare in Earth's atmosphere?
carbon dioxide
What layer in the Earth's atmosphere holds the highest oxygen content?
Stratosphere
What best describes the earth's atmosphere?
mostly nitrogen with 21% oxygen
What do you think earth atmosphere would be like today if life had not evolved one earth?
Almost no oxygen, lots of CO2, still mostly nitrogen.
How did the earth change after some bacteria started using photosynthesis?
Oxygen evolved for first time. Many compounds were oxidised
The oxygen content in the atmosphere of the early Earth is thought to have increased significantly once which of these developed?
green plants / algae
What do you think earths atmosphere would be like today if life had not evolved on earth?
Almost no oxygen, lots of CO2, still mostly nitrogen.
Why more earthquake in japan?
Because there are more volcanoes which bursts when our earth becomes warm and losses the atmospheric oxygen content.
What effects does oxygen have on the earths atmosphere?
Without its oxygen content the Earth's atmosphere would be composed almost entirely of nitrogen and would be chemically inert; oxygen causes the atmosphere to be chemically active (and breathable by humans).
What would happen if the earth evolved?
Clarify what you mean by "evolved".
The time in which life first evolved on Earth was the?
eff the time in wich life first evolved on earth!!
