Introduction
Soil is often called the “thin skin of the Earth,” but in IB Environmental Systems and Societies (ESS), it’s treated as much more than that. In the 2026 first assessment syllabus, soil is a core topic because it connects ecosystems, food production, and sustainability. Students must understand not just the properties of soil, but also the processes that form it, the pressures that degrade it, and the strategies used to conserve it.
Many ESS students underestimate soil because it seems basic compared to climate change or biodiversity. However, soil questions appear frequently in exams, often linked to food production, land use, and sustainability. Mastering this topic will help you write strong, systems-based answers.
Quick Start Checklist for ESS Students
When revising soil in ESS, make sure you can:
- Describe soil systems as storages and flows of matter and energy.
- Explain soil formation processes (weathering, decomposition).
- Identify major soil types and their characteristics.
- Evaluate causes and consequences of soil degradation.
- Discuss management strategies for soil conservation.
- Apply case studies to food production systems.
Soil as a System
ESS emphasizes a systems approach, so soil is studied in terms of:
- Inputs: organic matter, weathered rock, precipitation.
- Storages: organic matter, minerals, water, air.
- Outputs: uptake by plants, erosion, leaching.
- Transfers: infiltration, decomposition, nutrient cycling.
