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NL888 Posted 12 years ago
Grammar
Does "The oldest rocks that have been dated on the current earth surface are" mean...?
Does "The oldest rocks that have been dated on the current earth surface are" mean " the oldest rocks (which are taken from the current earth surface) that (the oldest rocks) have been dated are"?
Context:
The oldest rocks that have been dated on the current earth surface are approximately 4 billion years old, but nearly seventy meteorites and a number of moon rocks have been dated at 4.5 billion years old.
Context:
The oldest rocks that have been dated on the current earth surface are approximately 4 billion years old, but nearly seventy meteorites and a number of moon rocks have been dated at 4.5 billion years old.
Top answer
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2 Answers
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Scientists have picked up rocks from the earth's upper layer (the crust) and dated them. The oldest ones had an age of ~4 billion years.
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