Mention suitable terms for the following statements.
(a) Decrease in density of water on decreasing temperature from `4^(@)C` to `0^(@)C` which is opposite to the normal trend.
(b) The underground layer of water bearing permeable rock present below the water table
(c ) The natural process of adding water to atmospheric air and its subsequent condensation to rain water.
(d) Type of chemical reaction carried out when electricity is passed through water.

Explanation

(a) Anomalous expansion of water
(b) Aquifer
(c ) Water cycle
(d) Decomposition reaction