|
The caves are formed by water taking vegetation litter into cracks. As the veg decomposes, it gives off carbon dioxide. (CO2) This mixes with the water to form a weak acid solution which eats the rock, forming the caves.
Unfortunately, this is an on-going process, with many of the caves having an active sump, full of orange scum and giving off volumes of CO2.
CO2 is heavier than air, therefore sits in the bottom of the caves. At different times of the year, depending on water levels, rainfall, barometric pressure etc, this level can be higher up or lower.
I am hoping to go a bit deeper into grill next time, we'll see how the CO2 treats us.
Baz.
|