👩‍🏫 Teacher’s Guide

Objective
Evaluate a geographic decision using evidence, constraints, and uncertainty.

Vocabulary
elevation, contour interval, gradient

Suggested time
30-40 minutes, with optional practice across the week.

Teaching Notes

• Ask students to identify units and assumptions before calculating. Require a written explanation that separates observations, calculations, and conclusions.
• Introduce the study resource before assigning questions. Students can answer using this lesson without opening the source book.
• Use questions 1-4 for guided practice and the remaining questions for independent practice or discussion. Open responses may use different wording if the evidence supports them.
• Check the activity against its stated constraints and the answer bank. Revisit a missed concept before adding a new one.

🧒 Student Worksheet

Concept and Helping Material

Contour lines connect points of equal elevation. The contour interval is the vertical difference between neighboring contour values. Closely spaced contours usually indicate a steeper slope. To compare slope fairly, compare elevation change over the same horizontal distance. The simplified transects below are invented and rise steadily from their start to finish. Use the evidence to judge a claim or recommendation. Explain which conditions your conclusion depends on and what the data leave unanswered.

Study Resource

Contour values: 0, 50, 100, 150 meters. Each transect has a horizontal distance of 1000 m.

Vocabulary and Definition

• - height above a stated reference such as sea level
• - vertical difference between neighboring contour values
• - elevation change divided by horizontal distance

Words to Learn

, ,

Sentences to Fill In

1. The term for height above a stated reference such as sea level is .
2. The term for vertical difference between neighboring contour values is .
3. The term for elevation change divided by horizontal distance is .

🧪 Think & Respond Q&A

1. Which transect has the gentlest average slope?

2. Does the gentlest slope alone prove that A is a safe trail?

3. What would widely spaced contour lines usually suggest?

4. Can elevation alone reveal whether land is forested?

5. Why compare rise per distance rather than rise alone?

6. Is this case an actual survey of a named real location?

7. What should an evidence-based answer include?

8. Which lesson word means "height above a stated reference such as sea level"?

9. Which lesson word means "vertical difference between neighboring contour values"?

10. Which lesson word means "elevation change divided by horizontal distance"?

Hands-On Experiment or Activities

What You Need: Paper, pencil, and a calculator for checking arithmetic.

What You Do:

1. Draw side-view profiles of the three transects using matching axes. Label horizontal distance and elevation separately. Explain which is steepest.
2. Share your result. Ask a partner to check the evidence and challenge one assumption.
3. Revise one part of your work after checking it against the lesson evidence.

Think and Talk: What evidence supports one choice in your work?

Reflection

• Which idea can you explain now?
• What would you still need to learn about a real place?

Teacher Check

Check accurate use of the study resource, correct vocabulary or units, and a reason supported by evidence. For open activities, accept more than one result when it follows the instructions. The companion CSV contains the same numbered Q&A bank shown above.

Curriculum Reference

Original Grade 5 extension, Unit 3, Lesson 3. Builds on the map, environment, population, and planning skills in the Grade 1-4 course; no Grade 5 source book was supplied. The explanations, practice data, diagrams, activities, and questions in this lesson are original. Fictional datasets are labeled in their study resources.