Caves in the mountains can be the shelter for aquatic animals.
(a) Explain the pH change as the cause of tooth decay. How can we prevent tooth decay caused by pH variations?
(b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
Aquatic animals can breathe in water why?
Chandrayaan-1 has discovered large caves on the surface of the moon that can act as a human shelter.