Glossary: Any word with a glossary entry is highlighted like this. Moving the mouse over the highlighted word will show a definition of that word.

Downloads: Teachers can download individual diagrams, animations and other content from the Download Library area of the website. Terms and Conditions apply.

Animations: This topic has features with which you can interact, these are usually animations. Most of the animations can be expanded to full screen size, on a new window, ideal for showing on an interactive whiteboard. The animations will play all the way through or can be viewed one section at a time.

Activity: We propose an activity to help the students further consolidate their understanding of the topic.

Interactive Quiz: This topic features quizzes which you can use on any device. They provide a quick and easy way to test your knowledge on the subject.