Some people believe it may be millions of years old. - [Ryan] Mono Lake in particular has these tufa towers that are these limestone rocks that are made when the salt water mixes with the fresh water.
This remote Canadian wilderness is home to a spectacular waterfall twice the height of Niagara Falls
Tufa mounds are formed when heated water rises ... Nahanni — it continues to cut enormous ribbons through the limestone rock. Further downstream, the river calms and widens.
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