id	keyword
gc-36	caves
gc-36	speleothems
gc-36	roraima
gc-36	dissolution
gc-36	lithifi
gc-36	cueva
gc-36	brewer
gc-36	geologia
gc-36	sandstone
gc-36	charles
gc-36	water
gc-36	croatica
gc-36	samples
gc-36	genesis
gc-36	beds
gc-36	formation