Discussion
Three of the following record climate at annual resolution. Which is the odd one out?
Answer: C
Correct answer: deep ocean sediment cores
Deep ocean sediment accumulates at centimetres per thousand years and is stirred by burrowing organisms, so it cannot resolve individual years. Varved lake sediments, coral bands and tree rings all lay down a visible annual increment, which is what allows them to be counted and dated directly rather than by radiometric means.
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