True: Groundwater can be acidic & cause chemical weathering., Most caves formed 1000s of years ago from dissolved limestone (carbonation!), Stalactites come from ceiling., Stalagmites come from the ground., A sinkhole is left behind after a cave collapses., False: Groundwater is never acidic!, Most caves are new & are manmade, Stalactites come from the ground., Stalagmites come from the ceiling, A sinkhole has nothing to do with caves.,

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