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All quotes by Robert Duncan

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Unfortunately, we haven't found many very old rocks on Earth because our planet's surface is constantly renewed by plate tectonics, coupled with erosion.

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American Psychological Association (APA):

Quote By KeenBrain. Retrieved April 8, 2026, from

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“Quote By ” KeenBrain. n.d. Wed. 8 April. 2026 from

Chicago Manual Style (CMS):

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Using the appropriate style guide, simply copy and paste the information below to add the citation to your bibliography.

American Psychological Association (APA):

Quote By Robert Duncan KeenBrain. Retrieved April 8, 2026, from

/quotes/quote/r/robert_duncan_406731">

Modern Language Association (MLA):

“Quote By Robert Duncan” KeenBrain. n.d. Wed. 8 April. 2026 from

/quotes/quote/r/robert_duncan_406731">

Chicago Manual Style (CMS):

“Quote By Robert Duncan” KeenBrain. Accessed April 8, 2026.

/quotes/quote/r/robert_duncan_406731">

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