how is aquatic life benefited by the fact that water has maximum density at 4 degree Celsius
Answers
Typical conduct for a fluid is to develop warming and contract on cooling. A fluid that agreements is said to end up noticeably more thick.
Water carries on like an ordinary fluid when it's chilled off to 4 deg i.e. it contracts, however when chilled additionally off from 4deg to 0 deg it acts anomalously i.e. it grows as opposed to contracting further. So ice at 0 deg is less thick than water at 4 deg.
At the point when a lake begins getting cool the water at the best hits 4 degrees winds up plainly thick and sinks to the base, this continues occurring until the point when all water in the lake has achieved 4 deg. Presently when the temp outside drops encourage the water at the best hits 0 degree bad swings to ice however since ice at the best is less thick than the water at the base it doesn't sink, so notwithstanding when you see a lake solidified at the best the water underneath is still at 4 degrees where sea-going life can survive