Sun Powers Water

Grade Level

6th Grade

Duration

50 minutes

Class Size

20 students

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Unit

Cycles of Life: Water & Carbon
Lesson 3 of 10

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Learning Objectives

By the end of this lesson, students will be able to:

• Explain the sun’s role as the primary energy source driving the water cycle.
• Describe the process of evaporation and identify where it occurs in nature.
• Conduct a simple experiment demonstrating evaporation and interpret their results.

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Standards Alignment (Common Core & NGSS)

• Next Generation Science Standards (NGSS)

  • 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.
  • MS-ESS3-1: Construct a scientific explanation based on evidence for how the uneven distributions of Earth's mineral, energy, and groundwater resources are the result of past and current geoscience processes.

• Common Core State Standards (ELA - Literacy in Science and Technical Subjects)

  • CCSS.ELA-LITERACY.RI.6.1: Cite textual evidence to support analysis of science texts about the water cycle and sun energy.
  • CCSS.ELA-LITERACY.SL.6.1: Engage effectively in collaborative discussions with peers on the experiment and sun's role in evaporation.

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Materials Needed

• Small clear plastic cups (2 per student)
• Water
• Soil or sand (for cover)
• Small trays or plates (to place cups on)
• Thermometer (shared)
• Paper towels
• Chart paper or whiteboard for group data
• Markers
• Student science notebooks
• Timer or stopwatch
• Colored pencils for drawings
• Printed science reading passage about evaporation and sunlight (age-appropriate)

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Lesson Breakdown

1. Engage (7 minutes)

Goal: Activate prior knowledge and spark curiosity.

• Begin with an open question to the class:
  "Where do you think water in rain comes from?"
• Use a brief think-pair-share: students first think individually, then share with a partner, finally share answers with the whole class.
• Briefly recap what students know about the water cycle so far (from lessons 1 and 2).
• Show a simple diagram of the water cycle highlighting the sun and evaporation.
• Introduce today’s focus: the sun’s role in providing energy for evaporation.

2. Explore (15 minutes)

Goal: Hands-on experiment to observe evaporation.

• Introduce the experiment:
  "We will see how the sun’s energy makes water disappear by turning it into vapor. This is evaporation."

• Procedure:

  1. Fill each student’s plastic cup halfway with water.
  2. Place one cup in direct sunlight (window sill or classroom light source) and one cup in the shade or inside the room.
  3. Optionally, add a little soil to half of the cups to mimic natural conditions.
  4. Use the thermometer to measure the temperature near each cup; record the temperature.
  5. Set a timer for 10 minutes, then students observe and record any changes.

• During this, circulate, ask guiding questions:

  • "What is happening to the water in the cup in the sunlight?"
  • "Is evaporation faster in one place? Why might that be?"

• Have students write initial observations in their science notebooks.

3. Explain (10 minutes)

Goal: Clarify concepts through evidence and discussion.

• Use students' observations to discuss evaporation:

  • Water changes from liquid to vapor due to heat energy from the sun.
  • The process we observed is called evaporation.

• Read a short, grade-appropriate passage on sun-driven evaporation and the water cycle (teacher reads aloud or students read in pairs).

• Discuss vocabulary: evaporation, energy, water vapor, sun's rays.

• Reference NGSS MS-ESS2-4: Connect the experiment to the larger concept of the water cycle driven by solar energy.

• Engage students in summarizing:
  "How did the sun help the water in our experiment change?"

• Document student ideas on chart paper for reference.

4. Elaborate (12 minutes)

Goal: Deepen understanding through application and visualization.

• Ask students to draw their own model of the water cycle focusing on the sun’s role in driving evaporation.
• Encourage them to label the sun, water, evaporation, and clouds (if they include condensation steps).
• Students pair-share their drawings explaining how the sun provides energy for water to evaporate.
• Facilitate a discussion:
  • What would happen if there were no sun?
  • Why is evaporation important for life on Earth?
• Link this to real-world implications: droughts, water availability, weather patterns.

5. Evaluate (6 minutes)

Goal: Assess understanding by quick formative assessment.

• Conduct a brief exit ticket:
  Have students independently answer the following:

  1. What role does the sun play in the water cycle?
  2. What did you observe in your experiment about evaporation?
  3. Why is evaporation important to the water cycle?

• Collect exit tickets for review.

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Classroom Management Tips

• Prepare experiment stations in advance to save time.
• Use clear, concise instructions and model the experiment step-by-step.
• Keep the atmosphere interactive and encourage all students to share ideas.
• Use timers to keep activities on track.

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Differentiation Strategies

• For ELL or struggling readers: Provide vocabulary cards with images.
• For advanced students: Challenge them to think about how evaporation rates differ during different seasons or places on Earth.
• Use peer support during paired reading and discussion.

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Reflection for Teachers

• Did students grasp how the sun's energy drives evaporation?
• Were students able to connect hands-on observations with scientific concepts?
• Modify future lessons to include more visual aids or extended experiments if needed.

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This lesson blends inquiry, experimentation, and conceptual understanding to engage sixth graders actively in key scientific concepts tied directly to standards.