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Scientists can determine if oxygen existed in earths Archean atmosphere by?
Wiki User
∙ 9y ago
The Archean atmosphere is believed to have been free of free oxygen. Banded iron formations did not occur till near the end of the Archean period.
Wiki User
∙ 9y ago
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Many scientists believe a giant supercontinent once existed called?
pangaea
How did Alfred Wegener prove that pangaea existed?
truth is he couldn't prove it he tryed to show the scientists that the continents could have drifted but the scientists did NOT believe him
Who invented tornado?
Tornadoes have existed probably as long as there has been an atmosphere. Which was when the earth was made.
Was pangaea the only supercontinent that ever existed?
Scientists believe there were several other supercontinents before Pangaea.
Why is Earth's atmosphere rich in nitrogen and carbon dioxide today?
Nitrogen has, since plants and animals have existed, been the majority of gases in our atmosphere. Carbon Dioxide; however, has been increasing in our atmosphere since the industrial revolution. The causes are automobiles, coal-burning power plants and other carbon-emitting activities.
How did scientists determine that the Earth's mantle existed?
Scientists used detectors which determined the mantle existed. As well, scientists must hypothesize and theorize what cannot be readily seen, and make determinations based on the evidence that does exist.
How do scientists know that fish existed before amphibians?
Scientists know that fish existed before amphibians because fish were found in a lower layer of rock.
Do scientists think living could have existed on neptune?
no
Who are scientists that discovered medicines and what are the diseases they discovered?
Medicines have been used longer than scientists have existed.
What evidence led scientists to believe that neptune existed?
food
How do scientists know that the cro-magnons existed?
They found their skeletons.
How long ago do scientists estimate this supercontinent existed?
3 billion years.
Many scientists believe a giant supercontinent once existed called?
pangaea
During what era were the first one-celled organisms formed?
During the Archean Eon life started and was dominated by one-celled prokaryotic life forms. Eukaryotic one-celled organisms became dominant in the Proterozoic Eon. Multicellular organisms ruled the planet during the eon known as the Phanerozoic.
What are the two gases that existed in earths earlier atmosphere?
The original atmosphere of earth contained primarily ammonia and methane, very similar to the atmosphere on Venus and Jupiter today.
How did Alfred Wegener prove that pangaea existed?
truth is he couldn't prove it he tryed to show the scientists that the continents could have drifted but the scientists did NOT believe him
Why do scientists think mars may have once been a warmer place and may have had a thicker atmosphere?
Scientists have proven that liquid water once existed on Mars. Currently Mars is too cold and atmospheric pressure is too low for water to remain liquid, so both temperature and surface pressure must have been higher.
