Curriculum
Science — Third Preparatory
Science — Third Preparatory
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Unit 1 — Chemical Reactions and Their Environmental Impacts
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Question bank: Unit 1 — Chemical Reactions and Their Environmental Impacts
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Unit 2 — Electricity and Magnetism
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Question bank: Unit 2 — Electricity and Magnetism
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Unit 3 — Variation of Traits in Living Organisms
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Question bank: Unit 3 — Variation of Traits in Living Organisms
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Unit 4 — Dating Planet Earth
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- 1.1 How do we know that dinosaurs lived millions of years ago?
- 1.2 What is a fossil and how does it form?
- 1.3 Types of fossils
- 1.4 The fossil record
- 1.5 The importance of the fossil record
- 1.6 Causes of the diversity of life forms through time
- 1.7 Comparative anatomy
- 1.8 Summary of Lesson 1
- 2.1 How old is Earth?
- 2.2 The geologic time scale
- 2.3 Reading Earth's history from rocks and fossils
- 2.4 Determining the age of rocks
- 2.5 Relative age
- 2.6 Absolute age
- 2.7 Comparing relative and absolute dating
- 2.8 Exploiting resources and extinction (issue)
- 2.9 Summary of Lesson 2
- How a fossil forms, step by step
- How to read a rock column (relative dating)
- Choosing a dating method
- Half-life calculation recipe
- Common mistakes
- 📌 Comprehensive Scientific Terminology & Definitions:
- ⚖️ Governing Scientific Laws, Principles & Mathematical Formulas:
- 🔍 In-Depth Explanations, Deductions & Core Concepts:
- 📊 Common Radioactive Isotopes Used in Absolute Geological Dating:
- 💡 High-Yield Exam Traps & Key Takeaways:
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Question bank: Unit 4 — Dating Planet Earth
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Science — Third Preparatory 2026/2027
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Unit 1 - Force, Motion, Acceleration and Physical Quantities
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Text lesson
Unit 4 — Dating Planet Earth
Unit 4 — Dating Planet Earth
Choosing a dating method
Choosing a dating method
- If you are asked "which rock is older?" or "arrange the layers", use relative dating.
- If you are asked "how many years ago?", use absolute (radiometric) dating: count the half-lives.
- Use carbon-14 for remains of once-living things younger than about 50 000 years; use isotopes with very long half-lives, such as uranium-238, for very old rocks.
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