The Time Needed for a Typical Atom in an Oceanic

question 46

Multiple Choice

The time needed for a typical atom in an oceanic plate to complete a plate-tectonic cycle is ______________.

• A) about a hundred thousand years
• B) about a million years
• C) about 10 million years
• D) in excess of 250 million years
• E) about 4 billion years

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