<P> Modern tufa is formed from alkaline waters , supersaturated with calcite . On emergence , waters degas CO due to the lower atmospheric pCO ( see partial pressure ) , resulting in an increase in pH . Since carbonate solubility decreases with increased pH , precipitation is induced . Supersaturation may be enhanced by factors leading to a reduction in pCO , for example increased air - water interactions at waterfalls may be important , as may photosynthesis . </P>
<P> Modern tufa is formed from alkaline waters , supersaturated with calcite . On emergence , waters degas CO due to the lower atmospheric pCO ( see partial pressure ) , resulting in an increase in pH . Since carbonate solubility decreases with increased pH , precipitation is induced . Supersaturation may be enhanced by factors leading to a reduction in pCO , for example increased air - water interactions at waterfalls may be important , as may photosynthesis . </P>
tufa towers in mono lake form by the process of
tufa towers in mono lake form by the process of
alkaline waters , supersaturated with calcite
alkaline waters , supersaturated with calcite