23:58 Sep 20, 2016 |
English language (monolingual) [PRO] Science - Geology / معادن الطين | |||||
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| Selected response from: philgoddard United States | ||||
Grading comment
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SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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3 +7 | after one million years |
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after 1 my after one million years Explanation: Geology often uses Ma to represent million years, but on page 57 of my reference they appear to be using "ky" for "thousand years" and "my" for "million years". Reference: http://books.google.co.uk/books?id=rMWJNJ4pfKUC&pg=PA57&lpg=... |
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