Science · 5th Grade · Earth Systems and Human Impact · Weeks 10-18

Earth's Landforms and Changes

Students will investigate how constructive and destructive forces shape Earth's surface over time.

• Common Core State Standards
• 5-ESS2-1

About This Topic

Earth's surface is constantly being built up and worn down. Under NGSS standard 5-ESS2-1, fifth graders investigate how constructive forces , volcanic eruptions, sediment deposition, and tectonic uplift , create landforms, while destructive forces , weathering, erosion, and mass movement , break them down. The core scientific practice is comparing what these forces produce over very different timescales, from a flash flood that moves sediment in hours to a mountain range that builds over millions of years.

Students examine local and national examples: the Mississippi River delta, sea stacks along the Pacific coast, and glacially carved valleys in the Rockies. Connecting the abstract vocabulary of constructive and destructive forces to recognizable landscapes makes the concepts accessible and memorable. Students also explore how fast and slow processes leave different signatures on the land, preparing them for deeper geology work in middle school.

Active learning approaches that ask students to manipulate sand, water, and models develop the cause-and-effect reasoning NGSS demands. When students create and observe erosion in a stream table, they are generating the evidence they need to explain and predict landform changes , not just watching a process unfold.

Key Questions

1. Differentiate between constructive and destructive forces that shape landforms.
2. Analyze how weathering, erosion, and deposition contribute to landform changes.
3. Predict the long-term effects of a natural disaster on a specific landform.

Learning Objectives

• Compare and contrast the effects of constructive and destructive forces on Earth's landforms.
• Analyze the processes of weathering, erosion, and deposition and their role in shaping specific landforms.
• Predict the potential long-term changes to a chosen landform following a simulated natural disaster.
• Explain the difference in timescales between rapid and slow geological processes that alter landforms.

Before You Start

Properties of Rocks and Minerals

Why: Understanding the composition and properties of rocks is foundational to comprehending how they break down through weathering.

Water Cycle Basics

Why: Knowledge of how water moves through evaporation, precipitation, and runoff is essential for understanding water's role in erosion and deposition.

Key Vocabulary

Constructive Forces	Natural processes that build up Earth's surface and create new landforms, such as volcanic eruptions or tectonic uplift.
Destructive Forces	Natural processes that break down and wear away Earth's surface, including weathering, erosion, and mass movement.
Weathering	The process where rocks are broken down into smaller pieces by physical, chemical, or biological means.
Erosion	The movement of weathered rock and soil particles from one place to another, typically by wind, water, or ice.
Deposition	The process where eroded materials are dropped or settled in a new location, often building up new landforms.

Watch Out for These Misconceptions

Common Misconception

Destructive forces always happen fast and constructive forces always happen slowly.

What to Teach Instead

Students associate 'destructive' with sudden dramatic events like earthquakes. Stream table labs let them observe that slow, continuous water flow erodes substantial material within a single class period, while deposition , a constructive process , happens just as quickly downstream.

Common Misconception

Mountains were always there and don't change.

What to Teach Instead

Because mountains appear permanent on a human timescale, students assume they are static features. Discussing real-time GPS measurements showing the Himalayas growing a few millimeters per year, alongside erosion data from the Grand Canyon, helps students understand that all landforms are in a state of continuous, if slow, change.

Active Learning Ideas

Inquiry Circle: Stream Table Lab

Small groups use a stream table or aluminum pans filled with sand to model river erosion, deposition, and delta formation. Groups vary water speed or slope angle and record how each change affects where material is deposited. They then match their observations to a real river delta photograph and explain the connection.

55 min·Small Groups

Gallery Walk: Before-and-After Landforms

Display paired photographs showing a landform before and after a major event: a river bend before and after flooding, a coastline before and after a storm, a volcano before and after eruption. Groups rotate and classify the primary force as constructive or destructive, then rate its speed as rapid or gradual using evidence from the images.

30 min·Small Groups

Think-Pair-Share: The Disappearing Canyon

Ask students: if a river carves a canyon by erosion, where does all that rock material actually go? Partners trace the path of the sediment from canyon wall to riverbed to delta to ocean floor. The class shares and discusses how destruction in one location becomes construction in another.

20 min·Pairs

Real-World Connections

• Geologists use their understanding of erosion and deposition to predict where landslides might occur in mountainous regions like the Sierra Nevada, helping to plan safe routes for highways.
• Coastal engineers study wave action and deposition patterns to design seawalls and groins that protect communities like those along the Outer Banks of North Carolina from storm surges and beach erosion.
• Volcanologists monitor seismic activity and lava flows to understand constructive forces, informing evacuation plans for towns near active volcanoes such as Mount Rainier.

Assessment Ideas

Quick Check

Provide students with images of different landforms (e.g., a delta, a canyon, a mountain range, a sand dune). Ask them to label each image with the primary force (constructive or destructive) that shaped it and one specific process involved (e.g., deposition, erosion).

Exit Ticket

On an index card, have students draw a simple diagram illustrating either erosion or deposition. Below the diagram, they should write one sentence explaining how this process changes a landform and one example of a landform created or altered by it.

Discussion Prompt

Pose the question: 'Imagine a powerful earthquake causes a massive landslide in a local park. What are two ways this event could change the park's landscape over the next 100 years?' Encourage students to consider both immediate and long-term effects.

Frequently Asked Questions

What is the difference between weathering and erosion?

Weathering is the process that breaks rock into smaller pieces , it can be physical (like freezing water cracking rock) or chemical (like acid rain dissolving limestone). Erosion is the movement of those broken pieces to a new location by wind, water, or ice. Weathering breaks it down; erosion moves it away. Both processes work together to reshape landforms over time.

How do constructive and destructive forces work at the same time?

They often do. A river simultaneously erodes its banks upstream (destructive) and deposits sediment at its mouth (constructive). A volcano destroys the existing landscape with lava but also builds new land as the lava cools. Both processes operate continuously , just at different rates and in different locations within the same landscape.

How does a natural disaster change a landform over the long term?

A major event like a landslide or tsunami can reshape a coastline dramatically within hours. Over the long term, the new landform continues to be shaped by normal weathering and erosion. The event creates new material arrangements, and slower daily processes gradually smooth, sort, and redistribute that material over the following decades.

How does active learning help students understand Earth's landforms?

Physical modeling with sand and water provides direct evidence that students generate and own. When a student adjusts the slope in a stream table and watches the delta location shift, they are not memorizing a fact , they are operating the mechanism. This hands-on experimentation gives students the grounded mental models needed to analyze and predict real-world landform changes.