The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

Since the surface of the lake is at the same temperature as the air, no heat is lost

The density of water is maximum at 4 Degree C

None of the statements (a),(b),(c) given above is correct

The surface of a lake is frozen in severe winter, but the water at its

1.	The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?
A.	Ice is a bad conductor of heat
B.	Since the surface of the lake is at the same temperature as the air, no heat is lost
C.	The density of water is maximum at 4 Degree C
D.	None of the statements (a),(b),(c) given above is correct
Answer» B. Since the surface of the lake is at the same temperature as the air, no heat is lost