Biology
Biology, 23.08.2019 22:30, prohrer589

How much oxygen is contained in the atmosphere?

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Chemistry, 30.07.2019 22:30, Gabby1128
Which statement describes a process involved in the evolution of earth’s early atmosphere? - cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis. - heavier gases escaped through earth’s atmosphere, leaving only lighter gases such as oxygen behind. - volcanic eruptions produced enough oxygen to create earth’s atmosphere. - the amount of oxygen in the atmosphere declined due to respiration, or breathing.
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Biology, 13.08.2019 17:10, sauvifatcat
Which of the following is a true statement? a. more burial of organic carbon in sediments results in more oxygen in the atmosphere and oceans. b. more photosynthesis leads to more oxygen in the atmosphere and oceans. c. longer food chains with more consumers lead to more oxygen in the atmosphere and oceans. d. more volcanic co2 emission leads to more oxygen in the atmosphere and oceans.
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Chemistry, 30.08.2019 10:00, jrfranckowiak
Atmospheric chemists think that earth’s first atmosphere a. was very similar to today’s atmosphere. b. contained no oxygen atoms. c. consisted of carbon in the form of carbon monoxide. d. consisted of carbon in the form of carbon dioxide. e. contained nitrogen in the form of ammonia and nitrogen gas.
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Biology, 23.10.2019 00:00, lizdeleon248
The great oxygen event marks the time, approximately 2.5 billion years ago, when there was enough oxygen in the atmosphere to support a major burst of life on earth there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans there was significant oxygen in the atmosphere there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on earth photosynthesis was clearly established and producing oxygen.
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