1. Ice-Cold Lemonade
It was a hot summer day. Mattie poured herself a glass of lemonade. The lemonade was warm, so Mattie put some ice in the glass. After 10 minutes, Mattie noticed that the ice was melting and the lemonade was cold. Mattie wondered what made the lemonade get cold. She had three different ideas. Which idea do you think best explains why the lemonade got cold?
The coldness from the ice mixed into the lemonade.
The heat from the lemonade moved into the ice.
The coldness and the heat moved back and forth until the lemonade cooled off.

2. Ice Water
Christine put five ice cubes in a glass. After 20 minutes most of the ice had melted to form “ice water.” There were still some small pieces of ice floating in the water. Christine measured the temperature of the ice water then added five more ice cubes to the glass. She measured the temperature three minutes later. What do you predict happened to the temperature of the “ice water” three minutes after she added more ice?
The temperature of the “ice water” increased.
The temperature of the “ice water decreased.
The temperature of the “ice water” stayed the same.

10. Why Do Temperatures
vary on Earth?