Question

Give scientific reason:

In cold countries aquatic animals remain alive even after the rivers or lakes freeze in water.

Answer 1

1. Due to anomalous behaviour of water, in cold countries when water gets cool and turn to ice, its volume increases, so its density decreases 

2. Due to less density ice floats on water. 

3.  (a) Ice is a bad conductor of heat and electricity, (b) It doesn’t allow outside heat to go from the ice to water so water temperature below the ice doesn’t change, (c) It remains as water so aquatic animals remain alive even after the rivers or lakes freeze in winter.