Biology
Biology, 04.08.2019 14:50, la200564

What change occurred in the atmosphere 2.5 billion years ago

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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, 21.09.2019 04:30, shymitch32
Earth is very old, and it can be difficult to visualize where key events in the history of life occurred against this backdrop of "deep time." one common way to represent geologic time uses the analogy of a one-hour countdown timer. the timer starts from the top at earth’s origin (4.6 billion years ago) and moves clockwise to the present, making one full circle. in this analogy, one hour represents 4.6 billion years, one minute represents roughly 76.67 million years, and one second represents roughly 1.28 million years. (open hint 1 for an explanation of how these calculations are done.) a. 1.0 billion years oldb. 2.0 billion years oldc. 2.3 billion years oldd. 4.5 billion years old
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History, 05.10.2019 04:10, cjulius9437
Earth is very old, and it can be difficult to visualize where key events in the history of life occurred against this backdrop of "deep time." one common way to represent geologic time uses the analogy of a one-hour countdown timer. the timer starts from the top at earth's origin (4.6 billion years ago) and moves clockwise to the present, making one full circle. in this analogy, one hour represents 4.6 billion years, one minute represents roughly 76.67 million years, and one second represents roughly 1.28 million years. (open hint 1 for an explanation of how these calculations are done.) 1.0 billion years old 2.0 billion years old 2.3 billion years old 4.5 billion years old
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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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