Natural Disaster Impacts

Overview

This lesson explores how natural disasters such as earthquakes and hurricanes form, and how their effects can change ecosystems and human environments. Students connect patterns of tectonic activity to evidence-based explanations and practise constructing a short argument about impacts.

Learning intentions

Students will:

• investigate how earthquakes and hurricanes originate and how they spread through environments
• describe key evidence that supports plate tectonic explanations for earthquakes
• explain how tectonic and weather-related hazards can affect ecosystems and living things
• construct an evidence-based claim about disaster impacts and justify it with scientific reasoning

Success criteria

Students can:

• identify features of divergent, convergent and transform plate boundaries and link them to earthquakes
• describe at least two impacts of earthquakes and at least two impacts of hurricanes on ecosystems
• use evidence from given data/images to support a claim (not just opinions)
• communicate reasoning clearly using a simple CER structure (Claim, Evidence, Reasoning)

Curriculum links

• AC9S8U03: investigate tectonic activity, including formation of geological features at divergent, convergent and transform plate boundaries, and describe scientific evidence for plate tectonics
• AC9S8I07: construct evidence-based arguments to support conclusions or evaluate claims and consider ethical issues and cultural protocols when using/citing secondary data
• AC9S8H03: examine how proposed scientific responses to contemporary issues may impact on society, including ethical, environmental, social and economic considerations (focused on protecting ecosystems and communities from hazards)
• AC9S8I02: use a reproducible, structured investigation approach where appropriate (model-based or guided evidence task) and recognise/manage risks in practical tasks

Lesson structure (30 minutes)

1. 0–4 min · Retrieve and focus. Teacher prompts a quick recap: “What causes earthquakes in the Earth’s crust?” and shows a single image of plate boundaries. Students do a 30-second silent write, then share one idea with a partner.

2. 4–10 min · Direct teach: disaster causes. Teacher explains: earthquakes relate to plate boundary movement (divergent, convergent, transform) and hurricanes relate to conditions over warm ocean water (students view a simple cause-effect diagram). Students fill a “Cause → Hazard → Evidence” table with teacher-provided sentence starters.

3. 10–18 min · Evidence investigation: Earthquakes. Teacher gives a small set of printed or projected evidence (e.g., an earthquake epicentre map, a simplified cross-section showing a plate boundary, and a short excerpt describing patterns of earthquakes over time). Students complete a guided worksheet: “Which plate boundary type best matches the earthquake evidence?” and “What makes you think so?”

4. 18–24 min · Impacts on ecosystems. Teacher leads a short discussion using two ecosystem impact scenarios: (1) earthquake causes land deformation and habitat loss; (2) hurricane causes storm surge, flooding, and saltwater intrusion. Students choose one scenario and list three ecosystem impacts (abiotic and biotic), using a graphic organiser.

5. 24–29 min · Evidence-based argument (CER). Teacher models a CER response: Claim about disaster impact, Evidence from the provided materials/images, Reasoning that links cause to effect. Students write a 6–8 sentence CER on: “Which disaster is likely to cause more immediate damage to a coastal ecosystem, and why?” (They must cite at least two pieces of evidence from the lesson materials.)

6. 29–30 min · Exit check. Teacher collects one CER paragraph (or uses quick verbal check). Students complete a 1-minute self-check: “I used evidence by…” and “Next time I will…”

Resources

• Printed worksheet with “Cause → Hazard → Evidence” table and guided questions
• Earthquake evidence set: simplified epicentre map and cross-section diagram
• Short teacher-provided excerpt about earthquake patterns (no external web access required)
• Ecosystem scenario cards (earthquake vs hurricane) with prompts
• CER writing frame (Claim, Evidence, Reasoning) and sentence starters
• Coloured pencils or highlighters for evidence tagging
• Projector/board for diagrams (or printed equivalents)

Assessment

• Formative: teacher observes partner discussion and checks completed “Cause → Hazard → Evidence” entries for accuracy
• Formative: worksheet responses on matching plate boundary type to earthquake evidence
• Summative-in-lesson: CER paragraph assessed with a simple rubric (claim clarity, evidence used, reasoning linked to cause-effect)
• Exit check: one self-regulation sentence about evidence use

Differentiation

• Support: provide more sentence starters for CER and a word bank (e.g., “epicentre”, “habitat”, “flooding”, “plate boundary”); allow students to annotate evidence with prompts (“circle the part that shows…”).
• Support: reduce written load by allowing bullet CER if handwriting is a barrier, then teacher-to-student conferencing for reasoning.
• Extension: students include one ethical/cultural consideration when using secondary data (e.g., respectful attribution of sources and awareness that some community knowledge about disasters should be shared through appropriate protocols).
• EAL/SEN: use visual organisers, keep language demands consistent, and allow oral rehearsal before writing; provide a model paragraph for reference.