Tell students that they will be asked questions about the certainty of their predictions and that they should think about what scientific data is available as they assess their certainty with their answers. The atmosphere is continually changing, so the amounts are guidelines for what could happen rather than perfect predictions.) If there is a likelihood of precipitation, why is the amount of rain/snow shown as ranges? (The amount of precipitation that will fall is dependent on the amount of moisture in the atmosphere.It is more likely to precipitate when the temperature is the same as or lower than the dewpoint.) Why is the precipitation shown as a “%”? (Precipitation is dependent on other factors, such as relative humidity and temperature.Point out the line for precipitation potential (the brown line). The boxes below that line show whether the precipitation is likely to be rain, snow, freezing rain, or sleet. cloud cover), relative humidity, and chance for precipitation. The third box shows the predicted sky cover (i.e. The second box shows the predicted wind speed and direction. The first box shows the predicted temperature and dewpoint (along with wind chill or heat index, when applicable). This page shows the hourly weather forecast for your area. Ask them to input their zip codes into the "Local forecast by "City, St" or ZIP code" box in the top left (under "Home"), hit “Go”, scroll down to the bottom of the page, and click on the “Hourly Weather Graph”. ![]() Have students go to the NOAA National Weather Service. We see examples of scientists' uncertainty in the forecasting of precipitation amounts. Tell students that science is a process of learning how the world works and that scientists do not know the “right” answers when they start to investigate a question. Discuss the role of uncertainty in the scientific process. How does water cycle through Earth's systems? (Water moves throughout Earth's systems through precipitation, runoff, and evaporation, among other processes.)Ģ.How much of the water is available for us to use for things like drinking and crop irrigation-things that require fresh water? (Less than 3% of the total water on Earth is fresh water.). ![]() Click the image and carousel down arrows to see the full image.) Ask: (In media carousel click the photographs. Show the Diagram of Water Distribution on Earth. Tell students that most of Earth is covered with water. Engage students in thinking about how water is distributed on Earth.
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