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NotesESS HLTopic 1.3
Unit 1 · Foundations of ESS · Topic 1.3

IB ESS HL — Equilibrium, stability and resilience

At Higher Level, Topic 1.3 demands deeper quantitative analysis of equilibrium states, resilience thresholds, and tipping points. HL students evaluate how complex feedback mechanisms determine whether systems recover from disturbance or shift to alternative stable states.

1.3 FlashcardsExam technique guidePractice questions

Key concepts in Equilibrium, stability and resilience

Summary: Feedback, Stability, Tipping Points & Resilience

Freshwater lake example (eutrophication)

Exam link: This is a **positive (reinforcing) feedback loop** — more nutrients → more algae → less oxygen → more ecosystem damage → conditions that favour more algae.

Humans and resilience

What you'll learn in Topic 1.3

  • 1.3.1 Loops
  • 1.3.2 Resilience

Exam relevance

At Higher Level, ESS includes an extended essay component and deeper analytical questioning. Expect longer data-response questions and more complex case study scenarios in both Paper 1 and Paper 2.

Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 1.3 Equilibrium, stability and resilience

1.3.1

Loops

NotesFlashcards
1.3.2

Resilience

NotesFlashcards

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Topic 1.3 Equilibrium, stability and resilience forms a core part of Unit 1: Foundations of ESS in IB ESS HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.

Frequently asked questions

What does Topic 1.3 Equilibrium, stability and resilience cover in IB ESS?
Topic 1.3 covers equilibrium, stability and resilience as part of the IB ESS syllabus. Students learn key concepts, definitions, and real-world examples that are tested in Paper 1 and Paper 2 exams.
How should I revise Equilibrium, stability and resilience for IB ESS exams?
Start by reading the micro-topic notes to understand each concept, then use flashcards to memorise key terms. Practise exam-style questions to apply your knowledge under timed conditions and review the marking criteria.
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