Students studies the effect of ice on the temperature of a sample of water. First, they put 500mL of cold water (at 10C) into each of 4 beakers. Next, they measured and recorded the initial temperature of the water in each beaker. Then, they added various amounts of ice as shown in the table below. They continued to measure the temperature over a period of 30 minutes. Their results are shown in the graph. The temperature of the room during the experiment was 22C.