Five Themes of Geography — Location The Equator & Prime Meridian |

Five Themes of Geography — Location The Equator & Prime Meridian | Reference Lines Investigation | Grades 6–8

Help students understand the two reference lines at the heart of the global coordinate system with this no-prep geography investigation! Students explore the Equator and Prime Meridian, compare how each was established, and discover an important distinction: the Equator is based on Earth’s physical geometry, while the Prime Meridian’s location was established through historical international agreement.

This lesson is part of the Five Themes of Geography Series, a collection designed to help students build a deeper understanding of geography through real-world investigation, mapping, research, collaboration, and critical thinking. This lesson focuses on the theme of Location and can be used independently or alongside other lessons in the series.
Designed for 1–2 class periods, this lesson combines geography, history, research, and meaningful application.

WHAT’S INCLUDED
- Teacher Directions
- Student Overview + Mini Research Questions
- Group Activity Directions
- Research & Planning Pages
- Equator vs. Prime Meridian Comparison
- Physical vs. Historical Investigation
- Reference Lines Investigation Planner
- Digging Deeper Activities
- Color + printer-friendly B&W student pages

STUDENTS WILL LEARN
- Why the Equator is 0° latitude
- Why the Prime Meridian is 0° longitude
- How both lines support the global coordinate system
- How Earth’s physical geometry determines the Equator
- How historical agreement determined the Prime Meridian
- Why the Prime Meridian could have been located elsewhere
- How to compare physical geography with human decision-making

PERFECT FOR
- Sub Plans
- Five Themes of Geography
- Latitude & Longitude Units
- Map Skills
- World Geography
- Humanities & Social Studies
- Inquiry-Based Learning
- Geography Review
- Grades 6–8

WHAT TEACHERS LOVE
✓ Part of a cohesive Five Themes of Geography Series
✓ No-prep and easy to implement
✓ Designed for 1–2 class periods
✓ Connects geography with history
✓ Encourages research, comparison, and critical thinking
✓ Moves beyond simply memorizing 0° latitude and longitude
✓ Includes engaging group investigation and deeper-thinking tasks
✓ Color and B&W student pages included