Science · Grade 4

Active learning ideas

Fossils and Earth's History

Students learn best when they can connect abstract concepts to hands-on experiences. Fossils and Earth's history come alive when students physically model processes, compare materials, and discuss evidence. Active learning helps students move from memorizing names to understanding how science reconstructs the past.

• Ontario Curriculum Expectations
• 4-ESS1-1

• 20–45 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 45 min · Small Groups

Inquiry Circle: Making Trace Fossils

Students use clay and various objects (shells, leaves, plastic dinosaurs) to create 'molds' and 'casts.' They swap their molds with another group who must try to identify the 'organism' and what it was doing based on the print.

Explain how we know what an ecosystem looked like millions of years ago.

Facilitation Tip

During the Collaborative Investigation, circulate with a tray of modern bones and real fossils to prompt comparisons when students note differences in weight or texture.

What to look for

Provide students with images of different fossils (e.g., ammonite, trilobite, dinosaur footprint, leaf imprint). Ask them to identify each fossil and write one sentence explaining what it tells us about the past environment.

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Simulation Game
• 40 min · Small Groups

Simulation Game: Layers of Time

Using different colors of sand or soil in a clear container, students 'bury' objects at different levels. They then 'excavate' them and discuss why the objects at the bottom are usually the oldest, simulating the law of superposition.

Analyze why some types of organisms are more likely to become fossils than others.

Facilitation Tip

For the Simulation: Layers of Time, give each group a set of pre-cut paper layers of different colors to ensure clean, comparable strata.

What to look for

Pose the question: 'Why are shells and bones more likely to become fossils than soft tissues like leaves or jellyfish?' Facilitate a class discussion where students use their understanding of fossilization to explain the differences.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: The Mystery Fossil

Show a picture of a strange fossil (like an Anomalocaris). Pairs must brainstorm three things they can tell about its environment (e.g., did it live in water or on land?) based only on its physical features.

Infer what the location of a fossil can tell us about the movement of continents.

Facilitation Tip

When running the Think-Pair-Share: The Mystery Fossil, provide magnifying lenses and index cards for students to sketch and label fossil features before sharing.

What to look for

Give each student a card with a fossil location (e.g., 'Fossils of tropical plants found in northern Canada'). Ask them to write two sentences inferring what this fossil location suggests about Earth's past climate and continental position.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

A few notes on teaching this unit

Teach this topic by balancing concrete materials with guided inquiry. Start with tactile experiences like handling fossils and modeling layers, then move to structured discussions that connect evidence to conclusions. Avoid overwhelming students with too many fossil types at once; focus on depth over breadth. Research shows that students build stronger mental models when they first observe patterns before naming them.

By the end of these activities, students will explain how fossils form, interpret what fossils reveal about past environments, and describe how Earth's surface has changed over time. They will apply these ideas to examples from Canadian geography, particularly Ontario's ancient seas.

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Watch Out for These Misconceptions

• During the Collaborative Investigation: Making Trace Fossils, watch for students who assume fossils are always bone or wood.

  Pause the activity and have students hold a real fossil and a modern bone side by side. Ask them to describe the texture, weight, and material of each to highlight that most fossils are mineralized rock.

• During the Simulation: Layers of Time, watch for students who believe most living things become fossils.

  After the simulation, tally how many 'organisms' in each group were buried successfully. Ask students to calculate the percentage that fossilized and discuss why so few survived to become fossils.

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Methods used in this brief

• Inquiry Circle
• Simulation Game
• Think-Pair-Share