Physical Patterns in a Changing World · Term 2

Earthquakes and Volcanoes in Canada

Investigate the specific locations and impacts of earthquakes and volcanoes in Canada, particularly in British Columbia.

About This Topic

Weathering and erosion are the external forces that constantly reshape the Earth's surface. While tectonic processes build land up, weathering and erosion wear it down. This topic explores the difference between physical weathering (e.g., ice wedging) and chemical weathering (e.g., acid rain), and how agents like water, wind, and ice transport materials through erosion. In the Canadian context, the impact of glaciation is particularly significant, as massive ice sheets carved out the Great Lakes and scraped the soil off the Canadian Shield.

Students will analyze how these processes affect both the natural environment and human settlements. For example, they will look at coastal erosion in the Maritimes and how it threatens homes and infrastructure. This topic is best taught through hands-on experiments that simulate erosion and gallery walks featuring dramatic Canadian landforms shaped by these forces.

Active Learning Ideas

Hands-on Experiment: Erosion Trays

Students use trays of soil and sand to simulate how water flow creates different patterns of erosion. They test how adding 'vegetation' (moss or grass) can slow down the process.

⏱ 50 min·Small Groups

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Gallery Walk: Sculpted by Nature

Stations feature images of Canadian landforms like the Hopewell Rocks, the Niagara Escarpment, and glacial striations. Students must identify which agent (water, wind, or ice) was primarily responsible for each feature.

⏱ 40 min·Small Groups

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Think-Pair-Share: Human Impact

Students discuss how human activities like deforestation or building sea walls can speed up or slow down erosion. They share examples they have seen in their own community.

⏱ 20 min·Pairs

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Watch Out for These Misconceptions

Common Misconception

Weathering and erosion are the same thing.

What to Teach Instead

Weathering is the breaking down of rock, while erosion is the movement of those pieces. A 'break it and move it' sorting activity can help students distinguish between the two.

Common Misconception

Erosion only happens over millions of years.

What to Teach Instead

While some processes are slow, events like landslides or flash floods can cause massive erosion in minutes. Using 'before and after' photos of extreme weather events can illustrate this.

Frequently Asked Questions

What is the difference between physical and chemical weathering?

Physical weathering breaks rock into smaller pieces without changing its chemical makeup (like water freezing in a crack). Chemical weathering changes the actual minerals in the rock (like acid rain dissolving limestone).

How did glaciers shape the Canadian landscape?

During the last ice age, massive glaciers acted like giant sandpaper, scraping away soil, carving out deep valleys, and leaving behind deposits of sand and gravel. They are responsible for the millions of lakes across Canada.

Why is coastal erosion a problem in Canada?

In places like PEI and Newfoundland, powerful waves and rising sea levels are eating away at the soft coastline. This causes land to disappear, threatening homes, roads, and important ecosystems.

How can active learning help students understand weathering and erosion?

By conducting experiments with erosion trays, students can see the immediate impact of water and wind on the land. Active learning allows them to test variables, like the angle of a slope or the presence of plants, which helps them understand the complex factors that influence these natural processes.

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