Aimnova
DashboardMy LearningStudy Plan

Stay in the loop

Study tips, product updates, and early access to new features.

Aimnova

AI-powered IB study platform with personalised plans, instant feedback, and examiner-style marking.

IB Subjects

  • IB Diploma
  • All IB Subjects
  • IB ESS
  • IB Business Management
  • Grade Calculator
  • Exam Timetable 2026
  • ESS Predictions
  • BM Predictions

Study Resources

  • Free Study Notes
  • Revision Guide
  • Flashcards
  • ESS Question Bank
  • BM Question Bank
  • Mock Exams
  • Exam Skills
  • Command Terms

Company

  • Features
  • Pricing
  • About Us
  • Blog
  • Contact
  • Terms
  • Privacy
  • Cookies

© 2026 Aimnova. All rights reserved.

Made with 💜 for IB students worldwide

NotesESSUnit 4
IB ESS · Unit 4 of 8

Unit 4: Water

Unit 4 of IB Environmental Systems and Societies covers Water. This unit contains 4 topics and 18 sub-topics. Below you'll find free study notes, flashcards, and exam preparation resources for every topic in this unit.

4 topics18 sub-topics
ESS FlashcardsExam technique guide

What Unit 4 covers

Unit 4 examines freshwater and marine systems, global water scarcity, aquatic food production, and sources of water pollution. Students learn to evaluate the sustainability of water resource management and aquaculture — topics that frequently appear in IB ESS case study questions.

Topics in Unit 4

4.1

Water systems

4 sub-topics

4.2

Water access, use and security

5 sub-topics

4.3

Aquatic food production systems

4 sub-topics

4.4

Water pollution

5 sub-topics

Study tip: Work through the topics in order — each builds on concepts from the one before. Start with notes, then reinforce with flashcards and practice questions.

Ready to study Water?

Get AI-powered practice questions, personalised feedback, and a study planner tailored to your IB ESS exam date.

Start studying free
Unit 3Unit 5