The discovery of rocks dating to about 4.0 billion years ago implies crust formation happened during which time interval?

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Multiple Choice

The discovery of rocks dating to about 4.0 billion years ago implies crust formation happened during which time interval?

Explanation:
Rocks dated to about 4.0 billion years ago show the crust was already in place by that time, which means crust formation happened very early in Earth’s history. Since Earth formed around 4.56 billion years ago, having crust by 4.0 billion years ago places crust formation in the first billion years after formation. So the interval that best fits is the early first billion years. That’s why later intervals can’t explain the existence of 4.0 billion-year-old crust, and why the other options aren’t as consistent with the dating evidence.

Rocks dated to about 4.0 billion years ago show the crust was already in place by that time, which means crust formation happened very early in Earth’s history. Since Earth formed around 4.56 billion years ago, having crust by 4.0 billion years ago places crust formation in the first billion years after formation. So the interval that best fits is the early first billion years. That’s why later intervals can’t explain the existence of 4.0 billion-year-old crust, and why the other options aren’t as consistent with the dating evidence.

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