Landform Degradation Causes

Overview

In this lesson (11 of 24), students investigate how human activities connect to geomorphological processes that degrade distinctive landscapes. They will build on earlier learning about how erosion, transportation and deposition shape landforms by focusing on human-induced change and environmental impacts.

Learning intentions

• WALT understand the causes of landscape degradation and how they link to geomorphological processes.
• Students will discuss how human activities can increase erosion and sedimentation.
• Students will explain three different causes of degradation using examples.

Success criteria

• I can identify three human activities that lead to landform degradation.
• I can explain how each activity increases erosion or changes sediment movement.
• I can describe one likely environmental impact for each cause (e.g. poorer water quality, loss of habitat, unstable land).
• I can use key terms (erosion, sedimentation, runoff, vegetation cover) accurately in explanations.

Curriculum links

• AC9HG8K04: the interconnections between human activity and geomorphological processes, and ways of managing distinctive landscapes.
• AC9HG8K01: geomorphological processes that produce different landscapes and significant landforms (focus on erosion, transportation and deposition).
• AC9HG8S05: identify a strategy for action and explain potential impacts (briefly referenced as a “future link” to today’s causes).

Lesson structure (45 minutes)

1. 0–5 min · Hook conversation. Teacher shows two quick images: a hillside with vegetation removed and a nearby stream with muddy water; prompts “What changed, and what might that cause in the landscape?” Students do a think-pair-share and record one idea in a “Possible causes” note.

2. 5–12 min · Mini-teach: human links. Teacher explains how vegetation removal, construction and land use change can increase runoff, erosion and sedimentation, using a simple model (rain → bare soil → fast runoff → sediment in waterways). Students annotate a class diagram with teacher-guided labels: runoff, erosion, sedimentation, vegetation cover.

3. 12–23 min · Small group investigation (scaffolded). Teacher assigns each group one scenario card (choose at least 3 groups for the main scenario types):

• Scenario A: Overuse of tourist tracks in bushland
• Scenario B: Land clearing for farming/plantations
• Scenario C: Mining or quarrying nearby
• Scenario D: River regulation/urban development changing flow Students complete a “Cause → Process → Impact” worksheet in groups, using sentence starters and exchanging roles (reader, recorder, explainer).

4. 23–33 min · Gallery share: explain causes. Teacher sets a timer; each group shares one cause and its process link (1 minute each), while other students add one improvement question. Students listen and complete a class table: three causes + one process + one impact, aiming for depth rather than speed.

5. 33–41 min · Whole-class check: accuracy and examples. Teacher selects 2–3 student explanations (anonymous if needed) and asks: “Is the geomorphological process clear? Does the impact match the cause?” Students revise one explanation using a “tighten it” checklist: correct process term, specific impact, and a cause that clearly triggers the process.

6. 41–45 min · Exit ticket (quick assessment). Teacher collects exit tickets: “Name three causes of degradation and briefly explain how each connects to erosion or sedimentation.” Students complete the exit ticket independently (2–3 sentences total per cause).

Resources

• Scenario cards (at least 4 types) describing human activities and local environmental outcomes
• “Cause → Process → Impact” worksheet with sentence starters
• Class diagram of rain/runoff/erosion/sedimentation (printed or on board)
• Key word bank cards: erosion, sedimentation, runoff, vegetation cover, sediment, habitat
• Timer and grouping labels for 4–6 groups
• Exit ticket slips or digital form (no links required)

Assessment

• Formative: teacher checks group worksheets during the investigation step for correct cause-to-process links.
• Formative: during gallery share, teacher uses quick oral prompts to address misconceptions (e.g. confusing erosion and sedimentation).
• Summative-for-today (exit ticket): three causes with at least one correct process connection each.

Differentiation

• Scaffold (all groups): sentence starters such as “When ______ happens, ______ increases because ______, leading to ______ impact.”
• Small-group support: assign a “reader” role to a supportive student; provide scenario cards in shorter chunks with icons.
• Dyslexia-friendly options:
• Provide a coloured, high-contrast worksheet version with fewer words per section
• Offer audio recording of the scenario card text played by the teacher
• Allow students to respond using short bullet points instead of full sentences
• Extension: for students ready to go further, ask “What management action could reduce the degradation?” and require one impact-evidence link (kept brief for time).
• Language support: provide word bank definitions orally and on a one-page sheet; allow first-draft answers with preferred language then teacher prompts for Australian English/Geography terms.

Success criteria for this lesson (student-facing)

• I can name three human causes of landscape degradation.
• I can link each cause to a geomorphological process (erosion/transportation/deposition leading to sedimentation).
• I can explain a specific impact on people, places, or the environment.
• I can improve my explanation using feedback.