Unit Overview

Students master how water cycles through Earth's systems driven by sun energy and gravity. Through solving water park closure mysteries or investigating how pollution travels through water cycles causing acid rain, experiencing Water Cycle in a Jar demonstrations and dice-rolling water molecule journeys tracking paths through evaporation, condensation, and precipitation, and engineering drought solutions using conservation devices or technical drawings, students learn water continuously recycles never disappearing.

  • Lesson 1
    Lesson 1: Solve: Polluted Lakes + Water Park Mystery

    Solve: Polluted Lakes + Water Park Mystery

    Splashy Land, the famous water park, is forced to close—drought brings water restrictions crushing summer fun! Students follow Mosa tracing water's path, discovering the crisis is larger than expected. Water used in the park and community is part of a larger cycle: evaporation (sun heats water → becomes vapor), condensation (vapor cools → forms clouds), precipitation (rain/snow falls), collection (water gathers in oceans/rivers/groundwater), repeat. Mosa's creative solution: treat and recycle wastewater! Wastewater isn't waste—it's a water source that can be purified and returned to the environment for reuse. Splashy Land reopens using recycled water!

  • Lesson 2
    Lesson 2: Make: Travel the Water Cycle

    Make: Travel the Water Cycle

    Experience the water cycle firsthand! Part 1: Water Cycle in a Jar Demonstration—observe 250 mL tap water heated on hot plate, watch evaporation, see condensation on ice-filled beaker above, witness precipitation as droplets fall. Identify stages: boiling, evaporation, melting, condensation, precipitation. Part 2: Water Cycle Journey—use 9 dice rolling through stations (ocean, cloud, glacier, river, plant, animal, soil, groundwater, atmosphere), tracking your path as a water molecule. Students might: evaporate from ocean → condense in cloud → precipitate as snow → melt into river → absorbed by plant → transpired into atmosphere. Create annotated diagrams showing multiple possible water molecule paths through the cycle.

  • Lesson 3
    Lesson 3: Engineer: Engineer a Water Conservation Solution

    Engineer: Engineer a Water Conservation Solution

    Research a U.S. state experiencing drought using the United States Drought Monitor website, then engineer solutions! Students gather statistics on drought severity, water scarcity impacts, affected regions, then design either: (1) Conservation devices—rainwater harvesting systems, greywater recycling systems, atmospheric water generators, drip irrigation, fog-catching nets, or (2) Technical drawings—detailed plans for water-saving technologies. Build prototypes using cardboard, plastic cups, tubing, coffee filters, sand, gravel, bottles, or create professional technical drawings with specifications. Present drought solutions explaining how designs conserve, capture, or recycle water addressing state-specific challenges.

  • Next Generation Science Standards
    MS-ESS2-4
    Develop a model to describe the cycling of water through Earth's systems driven by energy from the sun and the force of gravity. [Clarification Statement: Emphasis is on the ways water changes its state as it moves through the multiple pathways of the hydrologic cycle. Examples of models can be conceptual or physical.] [Assessment Boundary: A quantitative understanding of the latent heats of vaporization and fusion is not assessed.]
  • Inquiry Scale
    • Each lesson in the unit has an Inquiry Scale that provides directions on how to implement the lesson at the level that works best for you and your students.
    • “Level 1” is the most teacher-driven, and recommended for students in 4th-5th grades. “Level 4” is the most student-driven, and recommended for students in 7th-8th grades.
    • For differentiation within the same grade or class, use different inquiry levels for different groups of students who may require additional support or an extra challenge.
  • Common Misconceptions
    • Students may initially believe that water disappears and reappears. Emphasize that water is conserved in a continual cycle.
    • Students may think that water comes from one particular source. Encourage them to notice that water flows through the cycle along many continual pathways.
    • Students tend to believe that water travels through the water cycle in a predictable circular path. Emphasize that the path of water can be complex and is not always the same.
  • Vocabulary
      • Precipitation
      • Evaporation
      • Transpiration
      • Condensation
      • Sublimation
  • Content Expert
    • Eric Pyle, PhD
      Professor, Department of Geology & Environmental Science James Madison University
  • Leveled Reading

    * To give our users the most comprehensive science resource, Mosa Mack is piloting a partnership with RocketLit, a provider of leveled science articles.

    • Your Very Own Pet Water Drop

      In this article, students read about the basic steps in the water cycle. The article discusses what causes most of the evaporation, how water drops gather together in the sky and why they fall back down to earth.

    • Water Everywhere!

      Water falls from the sky, but then what? This article looks at all the different places that students can find water on the surface of the earth and describes how water moves to and from each of these places.

    • It's Not Magic . . . It's Just a Phase

      In this article, students investigate the concepts of freezing point, boiling point, and melting point through a magic trick. They'll read about how a magician makes water change phase through heating and cooling at each of these temperatures.

Mosa Mack Science

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