History

History, 24.08.2019 07:30, bryantmadison0

What was the “oxygen revolution,” which took place 2.3 billion years ago? ?

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Biology, 27.06.2019 19:00, Brendah7145

The first life on earth is commonly beleived to have originated 3.5 bya (billion years ago), yet the rise of atmospheric oxygen didn't take place until almost a billion years after this. what does this tell us about the earliest forms of life on earth?

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Chemistry, 28.07.2019 23:10, scottbrandon653

Arock has 50 percent of its original amount of potassium-40 remaining in it. potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed? 1.25 billion years ago 2.50 billion years ago 5.00 billion years ago 6.25 billion years ago

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Geography, 16.10.2019 01:00, adeliabujang8881

Ameteorite was found to contain 40 argon-40 atoms for every 10 potassium-40 atoms. the half-life of postassium-40 is 1.25 billion years. assuming no loss of daughter isotopes, how old is the moon rock? 2.5 billion years old 3.75 billion years old 6.75 billion years old 10.5 billion years old

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Chemistry, 03.11.2019 06:31, Boris1002

Arock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed? a. 1.25 billion years ago b. 2.5 billion years ago c. 3.75 billion years ago d. 5 billion years ago

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