Earth’s Early Atmosphere (Grade 10)
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Earth’s Early Atmosphere
The earth's atmosphere has had major stage(s) in its evolution.
What gases do scientists speculate were lost from the Earth's primordial atmosphere, shortly after it formed?
- nitrogen and oxygen
- hydrogen and helium
- oxygen and hydrogen
- carbon dioxide and oxygen
Which best approximates the number of years after earth's formation that its primordial atmosphere was lost?
The gases that formed the early atmosphere originated primarily from
- solar wind
- meteorite impact
- volcanic eruptions
During what geologic era did free oxygen begin to accumulate in the earth's atmosphere?
Which process was largely responsible for today's atmospheric concentration of free oxygen?
The earth's early atmosphere most likely had a much higher concentration of carbon dioxide than today's atmosphere. What happened to the carbon dioxide (choose two)?
- it was dissolved into ocean water
- it was consumed by early life forms
- it was stripped from the earth by solar winds
- it was locked in sedimentary rocks and fossil fuels
Which of the following provides evidence of "The Great Oxidation Event"?
- presence of ancient impact craters
- isotopic studies of sedimentary rocks
- chemical composition of today's oceans
- travel times of seismic waves through the earth
Which of the following is thought to be a source of oxygen in earth's early atmosphere?
- tectonic activity
Which word best describes current scientific understanding of the earth’s early atmosphere?