Lesson 4

Unit 4 — Dating Planet Earth

Lesson parts

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

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

4.3 1.3 Types of fossils

4.4 1.4 The fossil record

4.5 1.5 The importance of the fossil record

4.6 1.6 Causes of the diversity of life forms through time

4.7 1.7 Comparative anatomy

4.8 1.8 Summary of Lesson 1

4.9 2.1 How old is Earth?

4.10 2.2 The geologic time scale

4.11 2.3 Reading Earth's history from rocks and fossils

4.12 2.4 Determining the age of rocks

4.13 2.5 Relative age

4.14 2.6 Absolute age

4.15 2.7 Comparing relative and absolute dating

4.16 2.8 Exploiting resources and extinction (issue)

4.17 2.9 Summary of Lesson 2

4.18 How a fossil forms, step by step

4.19 How to read a rock column (relative dating)

4.20 Choosing a dating method

4.21 Half-life calculation recipe

4.22 Common mistakes

4.23 📌 Comprehensive Scientific Terminology & Definitions:

4.24 ⚖️ Governing Scientific Laws, Principles & Mathematical Formulas:

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

4.26 📊 Common Radioactive Isotopes Used in Absolute Geological Dating:

4.27 💡 High-Yield Exam Traps & Key Takeaways: