Explain the following:

What is the role of anomalous behaviour of water in preserving aquatic life in regions of cold climate?

The behavior of water between its temperature from 0^° C to 4^°C is called anomalous behaviour of water.

Role of anomalous behaviour of water in preserving aquatic life:

(i) In winter, as the temperature of the atmosphere goes down due to which the water of the surface also cools down.

(ii) As a result, the temperature of whole water body decreases to 4^°C.

(iii) Now, as water on the surface at 4^° C cool down further, its volume increases and density also increases.

(iv) On reaching the temperature at 0^° C, water transforms into ice.

(v) The process of cooling becomes slow due to the low thermal conductivity of ice (ice bad conductor of heat).

(vi) Thus, a temperature of 4^° C is always maintained.

(vii) In normal conditions, the temperature goes on increasing.

(viii) This whole process preserves the aquatic life even in cold regions.