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The water cycle Chu trình nước The water cycle is often taught as a simple circular cycle of evaporation, condensation, and precipitation. Although this can be a useful model, the reality is much more complicated. The paths and influences of water through Earth’s ecosystems are extremely complex and not completely understood. NOAA is striving to expand understanding of the water cycle at global to local scales to improve our ability to forecast weather, climate, water resources, and ecosystem health.
The Water Cycle More free PPTs on: www.ecosystemforkids.com The Water Cycle Diagram More free PPTs on: www.ecosystemforkids.com What Is The Water Cycle ? • The water cycle is also known as the hydrological cycle or hydrologic cycle • It is constant movement of water on, above and below the surface of the Earth • The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation (https://pmm.nasa.gov) More free PPTs on: www.ecosystemforkids.com Stages Of The Water Cycle • Evaporation • Condensation • Sublimation • Precipitation • Transpiration • Infiltration • Runoff Evaporation is the process whereby water becomes Condensation is thewater process water vapor The is whereby water that rose into mainly from bodies like rivers, the vapor lakes,atmosphere oceans, wetassurfaces cools down altitudes Sublimation ishigh thethe process after rain etc.AtWhen water temperatures are low so water whereby ice sheets transform gets heated up by the sun it cools down to form water directly into water vapor This tends to evaporate into the Precipitation is the process Transpiration is the process droplets and ice particles happens especially in clouds polar atmosphere whereby condensed whereby plant leaves These which combine to release form areas have large fall to the Earth’s as water through thesurface stomata clouds Infiltration occurs when expanses of ice cover rain, the drizzle, sleet, snow or into atmosphere during water on the hail that falls Itback photosynthesis is similar to Earth’s surface through evaporation, the deep difference Runoff is theseeps water that runs precipitation into being that it originates from off after rainfall or when snow the soil This process plants melts into the channels thatwater flow increases ground into rivers, lakes, oceans and table other water reservoirs More free PPTs on: www.ecosystemforkids.com The Sun And The Water Cycle • The sun is what makes the water cycle work The sun provides what almost everything on Earth needs to go— energy, or heat Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds clouds that move over the globe and drop rain and snow This process is a large part of the water cycle (https://water.usgs.gov) More free PPTs on: www.ecosystemforkids.com The Water Cycle Diagram Precipitation is the process whereby condensed clouds fall to the Earth’s surface as rain, drizzle, sleet, snow or hail Infiltration occurs when water that falls back on the Earth’s surface through precipitation seeps deep into the soil This process increases the ground water table Sun is the driving force behind the process It heats the Earth’s surface and water bodies; this leads to evaporation The sun is also Condensation is the process thewhereby driver ofwater the process of into that rose photosynthesis that also the atmosphere as vapor Transpiration is the releases water through cools down At high altitudes process whereby plant transpiration temperatures are low so leaves release water water cools down to form through the stomata into water droplets and ice the atmosphere during Evaporation the combine to particles.is These photosynthesis process It is similarwhereby water form clouds to evaporation, becomesthe water vapor The difference being that it water is mainly from bodies originates from plants like rivers, lakes, oceans, wet surfaces after rain etc When the water gets heated up by the sun it tends to evaporate into the atmosphere Runoff is the water that runs off after rainfall or when snow melts into channels that flow into rivers, lakes, oceans and other water reservoirs More free PPTs on: www.ecosystemforkids.com Identify The Following How they relate to the water cycle ? More free PPTs on: www.ecosystemforkids.com www.ecosystemforkids.com • Visit the website above for more free science teaching resources for teachers and parents of students in 1st to 6th grades • Features: Free | PowerPoint Lessons | Worksheets pdf | Online quizzes | Games | Board Games | Card Games | More More free PPTs on: www.ecosystemforkids.com