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I was casually browsing the google earth street view map today. And I noticed strange cavities in a rock wall on Henderson Island, a coral island in the South Pacific. What could have caused this to form?

link enter image description here

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  • $\begingroup$ look up chemical weathering. $\endgroup$
    – John
    Mar 24 at 14:51

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These are calcite-based rock layers and the reaction between these and H2CO3 (CO2 +H2O) causes the calcite to erode.

Consequently, the reaction:

H2O +CO2 -> H2CO3

H2CO3 +CaCO3 <-> Ca + 2 HCO3

This reactin is mainly found in slightly acidic environments.

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