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 Q-Science-Gr7-SQSA1-CBT (2020-21) Question: 1-9
 Evidence suggests that Earth is about 4.6 billion years old, even though no Earth rocks have been found that can be dated at more than 4 bilion years old. This discrepancy is most likely caused by Earth's
 original crust being
 Difficult to date so precisely
 Subject to extensive erosion
 Blasted away during Earth's formation
 Destroyed by solar radiation
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