Lesson 4

Unit 4 — Dating Planet Earth

Lesson parts

4.1 1.1 How do we know that dinosaurs lived millions of years ago?

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4.2 1.2 What is a fossil and how does it form?

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4.3 1.3 Types of fossils

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4.4 1.4 The fossil record

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4.5 1.5 The importance of the fossil record

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4.6 1.6 Causes of the diversity of life forms through time

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4.7 1.7 Comparative anatomy

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4.8 1.8 Summary of Lesson 1

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4.9 2.1 How old is Earth?

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4.10 2.2 The geologic time scale

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4.11 2.3 Reading Earth's history from rocks and fossils

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4.12 2.4 Determining the age of rocks

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4.13 2.5 Relative age

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4.14 2.6 Absolute age

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4.15 2.7 Comparing relative and absolute dating

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4.16 2.8 Exploiting resources and extinction (issue)

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4.17 2.9 Summary of Lesson 2

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4.18 How a fossil forms, step by step

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4.19 How to read a rock column (relative dating)

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4.20 Choosing a dating method

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4.21 Half-life calculation recipe

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4.22 Common mistakes

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4.23 📌 Comprehensive Scientific Terminology & Definitions:

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4.24 ⚖️ Governing Scientific Laws, Principles & Mathematical Formulas:

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4.25 🔍 In-Depth Explanations, Deductions & Core Concepts:

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4.26 📊 Common Radioactive Isotopes Used in Absolute Geological Dating:

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4.27 💡 High-Yield Exam Traps & Key Takeaways:

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