Which of the following carries a climate signal?

Question

BlackTom AI · Accepted Answer

The question asks which item carries a climate signal. Unfortunately, the provided data includes an answer field listing 'Stalactites' as the correct option, but there are no answer options supplied in the answer_options field to compare or contrast.

Nonetheless, I can explain why stalactites are known to carry climate signals in general. Stalactites (and stalagmites) form through the slow deposition of minerals from dripping water in caves. The chemistry of the drip water — including isotopic ratios of oxygen and hydrogen, trace element concentrations, and growth rates — is influenced by surface climate conditions such as temperature, precipitation, and vegetation, which affect the water that percolates through the soil and rock. As a result, the incremental layers that build up stalactites record these climatic variations over time. By examining the layered structure and performing isotope analyses or trace element profiling, scientists can reconstruct past climate changes.

If there were other options, we would evaluate them against this criterion: does the option pertain to a geo- or paleoclimate proxy capable of preserving environmental signals in its growth or composition? Options like ice cores, tree rings, sediment cores, or corals are classic climate signals as well, while something that doesn’t respond to climate or doesn’t preserve a historical record would be incorrect.

In the absence of the full set of choices, we can affirm that stalactites are among geological features used to infer climate signals, due to their potential to archive environmental information in their mineral layers.

Section Merge: Earth 103N (Spring 2025) Graded Midterm 1

Which of the following carries a climate signal?

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