SCIENCE GRADE FOUR – WEATHER Air pressure Observation Prediction Water cycle Wind Vocabulary: Air pressure Evaporation Humidity Precipitation Water cycle Weather Instruments Thermometer Essential Understandings: Air has pressure The water cycle is a sequence involving heating, evaporation, cooling and condensing A thermometer is used to measure air temperature Different instruments are needed to measure weather Wind is caused by uneven air pressure and has direction and speed A variety of factors can be used to predict the weather Direct observation of the appearance of the sky can tell us about weather