A 0.316-m-thick sheet of ice covers a lake. The airtemperature at the ice surface is -17.5 °C. In 3.10 minutes,the ice thickens by a small amount. Assume that no heat flows fromthe ground below into the water and that the added ice is very thincompared to 0.316 m. Calculate the number of millimeters by whichthe ice thickens.