Geology Basics
The four-billion-year story of the Earth in five lessons.
Lessons in this unit
- Lesson 01: What is geology, and what is the Earth made of? — Know what geology studies, and name the Earth's main layers from the surface down to the centre.
- Lesson 02: The three kinds of rock & the rock cycle — Name the three rock families, what makes each one, and how rocks turn into one another over time.
- Lesson 03: Igneous rock — and what 'intrusive' really means — Tell magma from lava, intrusive from extrusive rock, and understand the word 'intrusion'.
- Lesson 04: Sedimentary rock, layers & deep time — Understand how sedimentary rock and its layers form — and how those layers tell us how old things are.
- Lesson 05: The restless Earth — plates, faults & folds — Understand plate tectonics and the everyday words for how rock bends, breaks, and moves.