What is my bedrock?
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I'm looking for a rock from which my island is constructed. It needs to be:
- Either created from the sea or via intense pressure/heat
- Capable of trapping layers of gas beneath it
- White(ish)
I was thinking about limestone but I'm not sure if islands with large quantities of limestone are realistic. Also could a softer rock such as limestone trap large quantities of natural gas (methane and hydrogen) beneath the surface?
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