Exploring Erosion Effects

Overview

Students will investigate the process of erosion and how natural forces such as wind, water, and ice alter the Earth’s surface. This introductory lesson connects scientific concepts to the local environment in British Columbia, encouraging observation, inquiry, and hands-on learning.

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Curriculum Connections

Grade: 3
Subject: Science
Duration: 60 minutes
Class Size: 20 students

BC Curriculum Big Idea

• Earth materials are solid rocks and soils, which make up the Earth’s surface and provide the foundation for living things.

Curricular Competencies

• Demonstrate curiosity and a sense of wonder about the world by exploring and asking questions about it.
• Make observations aimed at identifying their own questions about the natural world.
• Use ideas and evidence to explain their observations and experiences.
• Communicate their observations and experiences orally and through drawings and writing.

Content

• Soil and rock types, their characteristics, and how they can change due to natural processes (erosion).
• Processes that shape the Earth (weathering, erosion by wind, water, ice).
• Local examples of erosion in British Columbia landscapes.

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Learning Objectives

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

1. Define erosion and describe how wind, water, and ice cause erosion.
2. Identify examples of erosion in their local environment.
3. Demonstrate erosion using a hands-on sand and water simulation.
4. Communicate their understanding of erosion through discussion and a worksheet.

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Materials Needed

• Computer and projector for slideshow
• Real photographs of BC landscapes showing erosion (e.g., coastal cliffs, riverbanks, glacier valleys)
• Large shallow trays (1 per group of 4 students)
• Fine sand (enough for all groups)
• Water spray bottles or small watering cans
• Worksheet: "Erosion Explorers" (includes diagrams and simple questions)
• Whiteboard and markers
• Chart paper for group notes

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Lesson Flow

1. Introduction (10 minutes)

• Hook: Begin with a question on the board: “Have you ever seen where the land has been worn away by wind or water?”
• Show a short slideshow of erosion examples, focusing on landscapes students might recognise from around BC (e.g., Vancouver Island beaches, Rocky Mountain glaciers, Okanagan riverbanks).
• Invite students to share any personal experiences or observations of erosion. Record some on chart paper.

2. Direct Instruction (10 minutes)

• Define erosion clearly: “Erosion is when wind, water, or ice move pieces of soil and rock from one place to another.”
• Briefly describe how each agent of erosion works:
  • Wind picks up and carries away small particles.
  • Water can wash soil downhill or wear away riverbanks.
  • Ice (glaciers) can scrape and carry rocks as they slowly move.
• Use simple labelled diagrams on the board or projector.

3. Hands-On Activity: Sand and Water Erosion Simulation (25 minutes)

• Arrange students into 5 groups of 4 around trays filled with sand.
• Demonstrate how to simulate rainfall using a spray bottle or watering can to gently pour water on the sand.
• Students take turns spraying water slowly to watch how sand moves and forms channels (simulating erosion).
• Ask them to observe what happens to the sand — where it moves and what shapes form.
• Encourage them to try changing the intensity of water flow and observe differences.
• Circulate and ask guiding questions:
  • “What do you notice about how the sand moves?”
  • “How might this be similar to what happens during rainfall on hillsides?”
  • “What might wind erosion look like if we did the same with air?”

4. Worksheet and Group Discussion (10 minutes)

• Distribute the "Erosion Explorers" worksheet. Includes:
  • Fill-in-the-blank definitions of erosion agents
  • Matching images to erosion types
  • Short answer: “Name one place in BC where you think erosion happens and why.”
• While students work, facilitate a group discussion. Invite groups to share their observations from the simulation.
• Write key vocabulary and concepts on the board as students share (erosion, soil, wind, water, glacier).

5. Wrap-Up and Reflection (5 minutes)

• Summarise key points: Erosion by wind, water, and ice changes the land. This can happen slowly or quickly.
• Ask a few students: “What surprised you about erosion today?” or “Why is it important to understand erosion in BC?”
• Introduce that next lesson will focus on deposition, where the materials moved by erosion settle and build new landforms.

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Assessment and Evaluation

• Formative:
  • Informal observation of participation and understanding during slideshow discussion and hands-on activity.
  • Responses on the worksheet to check comprehension of erosion concepts.
• Summative (for Lesson 2):
  • Will incorporate combined knowledge of erosion and deposition with a project or presentation.

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Differentiation Strategies

• Provide labelled diagrams with visuals and fewer words for students needing language support.
• Pair students strategically to encourage peer learning during the hands-on activity.
• Use oral questioning for those who may struggle with written tasks on the worksheet.
• Provide a vocabulary word bank on the worksheet.

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Extension Ideas

• Encourage students to take photos or draw erosion signs at local parks or neighbourhoods as a homework exploration.
• Create a simple classroom erosion model using ice cubes moving through sand to simulate glacier erosion in Lesson 2.

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Teacher Reflection Points

• Did students make connections between real-world examples and the simulation?
• Were students able to explain erosion in their own words?
• How did the hands-on activity deepen understanding?
• Adjust pacing for the next lesson based on this lesson’s engagement and content grasp.

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This lesson offers a blend of local context, inquiry, hands-on exploration, and aligned British Columbia curriculum competencies — ensuring students develop scientific literacy and curiosity about their environment.