2. It’s estimated that 1.1 billion people don’t have easy access to drinking water, and 2.6 billion people don’t have water that’s clean enough. The Celsius temperature scale is based on the freezing point (0 degrees) and boiling point (100 degrees) of water. The water you drink is the same water that’s been around since before dinosaurs existed. A water molecule can spend 3,200 years in the ocean before going through the water cycle and up to 10,00 years in deep underground caves.

3. Name the process and describe the role of energy in the following phase changes. Ice  water Water vapor  water Water  ice Ice  water vapor