This lesson was a 100 minute lesson with a high ability year 9 group. They really investigating all the resources. Students worked in small groups. I broke up the reading by playing the 3 videos (click on the powerpoint). This helped students to access the information.

2 50 minute lessons. This was designed for a mixed ability year 9 group. Some great Q and A came out.

Designed for low ability groups. Both worksheets have differentiated versions.