How can aquatic animals survive when the lakes and seas freeze?
AS you know when heat is applied a metal, a liquid or even a gas, it expands. Hence it is said that heat expands and cold contracts. There is, however, one exception to this rule. When the temperature of waterfalls below four degrees Celsius, it does not contract, but expands. It keeps on expanding till it reaches zero degrees Celsius. As a result, ice is formed on the surface and since it is lighter than the water below, it floats on the surface. The fish and other animals freely move about in the water "below. Isn't it a miracle of Nature?
AS you know when heat is applied a metal, a liquid or even a gas, it expands. Hence it is said that heat expands and cold contracts. There is, however, one exception to this rule. When the temperature of waterfalls below four degrees Celsius, it does not contract, but expands. It keeps on expanding till it reaches zero degrees Celsius. As a result, ice is formed on the surface and since it is lighter than the water below, it floats on the surface. The fish and other animals freely move about in the water "below. Isn't it a miracle of Nature?