The formation of the Isua supracrustal belt is thought to have started about 3.8 billion years ago.

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• 1It took a long time for the melted crust to become hard.

  A.right

  B.wrong

  C.not mention

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• 2Scientists once estimated that Earth’s crust started shifting three billion years ago.

  A.right

  B.wrong

  C.not mention

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• 3Earth cooled down shortly after it was formed.

  A.right

  B.wrong

  C.not mention

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• 4The shape of lands and oceans are slowly changed with the movements of plates.

  A.right

  B.wrong

  C.not mention

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• 5The ground beneath our feet is indeed still.

  A.right

  B.wrong

  C.not mention

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• 6The lsua supracrustal belt is now a popular holiday resort.

  A.right

  B.wrong

  C.not mention

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