| Lesson Plan |
| Grade: |
Date: 04/03/2026 |
| Subject: Geography |
| Lesson Topic: Volcanic explosivity index (VEI) |
Learning Objective/s:
- Describe the components and scale of the Volcanic Explosivity Index (VEI).
- Calculate an approximate VEI using tephra volume.
- Analyse how VEI values inform hazard mapping and emergency planning.
- Evaluate the limitations of the VEI in assessing volcanic risk.
|
Materials Needed:
- Projector and screen
- PowerPoint presentation with VEI scale diagram
- Handout of VEI table
- Calculator or spreadsheet for sample calculations
- Whiteboard and markers
- Printed case‑study sheets of historic eruptions
|
Introduction:
Begin with striking images of recent volcanic eruptions and ask students what factors determine their impact. Recall prior learning on volcanic hazards and introduce the VEI as a tool to quantify eruption size. Explain that by the end of the lesson they will be able to compute VEI values and discuss their relevance to risk assessment.
|
Lesson Structure:
- Do‑Now (5'): Students match eruption photos to VEI categories on a quick worksheet.
- Mini‑lecture (10'): Present the VEI scale, its logarithmic nature, and key parameters using slides.
- Guided calculation (10'): Work through the sample 5 km³ tephra calculation together; students use calculators.
- Group activity (15'): In small groups, analyse a case study (e.g., Mount Pinatubo) to identify VEI, associated hazards, and emergency responses; record findings.
- Whole‑class discussion (5'): Groups share insights; teacher highlights limitations of the VEI.
- Check for understanding (5'): Exit ticket – write one way VEI informs hazard planning and one limitation.
|
Conclusion:
Summarise how the VEI provides a concise measure of eruption magnitude and its role in hazard mapping. Reinforce the importance of recognising its limitations when planning emergency responses. For homework, students complete a worksheet calculating VEI for two additional historic eruptions.
|