The Hidden World Beneath Us

Lesson Information

• Subject: Science
• Year Group: Year 3
• Lesson Duration: 189 minutes
• Number of Students: 21
• Curriculum Link: National Curriculum for Science (England):
  • Science - Biology (Living Things)
  • Learning about how soil provides a habitat and supports biodiversity
  • Understanding how living things depend on each other and their environment

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Lesson Intent (LI)

To understand the habitat soil provides and its importance in supporting life.

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Lesson Overview

This lesson is designed to immerse Year 3 students in the fascinating world of soil. They will explore the hidden ecosystem beneath their feet, understand the importance of composting, and explain why soil plays a crucial role in supporting biodiversity. Through hands-on investigations, discussions, and collaborative work, students will develop a deeper appreciation for soil's role in the natural world.

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Resources Needed

• Soil samples (from different locations if possible)
• Magnifying glasses
• Plastic trays
• Tweezers or small spoons
• White paper for contrast
• Clipboards and worksheets for observations
• Laptops/tablets (if available) for research
• A composting bin (or visual aids showing composting stages)
• Various organic materials for composting (banana peels, leaves, etc.)
• Printed habitat fact sheets
• Colouring materials for diagrams

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Lesson Breakdown

Chunk 1: Discovering Soil as a Habitat (60 minutes)

Introduction (15 minutes)

• Begin with an engaging question: "What do you think lives in soil?" Encourage a Think-Pair-Share discussion.
• Show images of different soil types and organisms living in soil (worms, insects, fungi, bacteria).
• Explain how soil is a habitat & supports life by providing shelter, food, and a place to grow.

Main Activity: Soil Investigation (35 minutes)

• Step 1: Split students into small groups of 3-4. Give each group a tray, a soil sample, magnifying glasses, and tweezers.
• Step 2: Students carefully examine their soil, picking out living organisms or evidence of life (roots, insects, decomposing leaves).
• Step 3: Encourage students to record their observations on a worksheet, illustrating and labelling the living things they find.
• Step 4: Discuss findings as a class. What differences did they notice? What role do these creatures play in soil health?
• Bonus Challenge: Compare soil from different areas (school garden vs. playground soil). How are they different?

Reflection (10 minutes)

• Gather students and discuss: Why do these creatures choose soil as their home?
• Introduce the concept of decomposers and how they recycle nutrients.
• Highlight the importance of soil in ecosystems—without it, plants couldn't grow!

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Chunk 2: Composting & Soil Health (65 minutes)

Introduction to Composting (15 minutes)

• Ask students: "What happens to dead leaves and food scraps? Where do they go?"
• Show a compost bin (or pictures of one). Explain that composting is nature's way of recycling!
• Introduce keywords: organic matter, decomposition, nutrients, bacteria, fungi.

Main Activity: Building a Compost Model (40 minutes)

• Step 1: As a class, create a composting model using clear containers, layering:
  • Browns: Dry leaves, cardboard scraps, shredded newspaper.
  • Greens: Banana peels, apple cores, small bits of torn grass.
  • Soil: Add a handful of soil with microbes to kickstart decomposition.
• Step 2: Students make predictions—what will happen over time?
• Step 3: Discuss why composting is important for soil health. Link to reducing waste & enriching garden soil.
• Step 4: Play a quick sorting game—students decide whether an item can be composted or not.

Reflection (10 minutes)

• Discuss how healthy soil helps grow food—without good soil, no fruits, vegetables, or trees!
• Ask students to think of ways they can help soil stay healthy at home and in school.

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Chunk 3: Soil & Biodiversity (64 minutes)

Introduction (10 minutes)

• Define biodiversity—the variety of living things in an environment.
• Discuss: "What would happen if soil disappeared?" (No plants = no animals!)
• Link to real-world issues (deforestation, farming, and protecting soil).

Main Activity: Soil Habitat Poster Challenge (40 minutes)

• Step 1: Each group chooses a soil-dwelling organism (e.g., worms, insects, fungi, bacteria).
• Step 2: Students create a poster explaining:
  • What their organism does in soil.
  • Why it is important to the ecosystem.
  • A fun "Did You Know?" fact.
• Step 3: Groups present their posters to the class in a “gallery walk” style (students walk around and learn from each other).

Final Reflection (14 minutes)

• Summarise key takeaways: Soil is alive, supports many species, and is vital for life.
• Ask: "What was the most surprising fact you learned today?"
• End with an interactive quiz—students answer quick-fire soil-related questions.

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Assessment & Evidence of Learning

✅ Observation Notes: Teacher monitors discussions & engagement during activities.
✅ Investigation Worksheets: Checking students' ability to identify soil organisms.
✅ Poster Challenge: Assessing understanding of biodiversity in soil habitats.
✅ Quick-Fire Quiz: Informal assessment of key concepts learned.

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Adaptations & Extensions

For High-Achieving Students:

• Challenge them to investigate different types of soil (e.g., clay vs. sand) and their effect on biodiversity.
• Ask them to research and present a case study on soil erosion and its impact.

For Lower-Achieving Students:

• Provide sentence starters for written reflections and poster challenge.
• Offer visual aids and hands-on guidance during investigations.
• Allow extra time for discussions and group work.

Cross-Curricular Links:

• Geography: Links to soil types & environmental conservation.
• Art: Poster creation incorporates creativity and design.
• Literacy: Encourages use of scientific vocabulary & explanation writing.

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Plenary: The Big Picture

To wrap up, the teacher asks:
💡 "If soil could talk, what would it say?"
Students give one sentence from soil’s perspective, e.g., "I am home to a billion tiny creatures keeping nature alive!"

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Teacher Reflection & Next Steps

🔍 How did students engage with the hands-on elements?
💬 Were they able to grasp key concepts?
🌱 Next lesson: Exploring plant growth & the role of soil nutrients!

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🌟 This lesson is designed to spark curiosity, encourage exploration, and develop a lifelong appreciation for the hidden world beneath our feet. Let’s dig in! 🌟