1. © Nuffield Foundation 2011 Nuffield Mathematics Activity Ozone hole © NASA

2. © Nuffield Foundation 2011 Ozone in the stratosphere stops harmful ultra-violet radiation coming down to the Earth There is an ‘ozone hole’ each year over Antarctica. The photograph shows one of the largest ever ozone holes – it occurred on 24 September 2006 Blue and purple colours show where there is the least ozone. Green and yellow show where there is more ozone.

3. © Nuffield Foundation 2011 In this activity you will suggest functions that could be used to model real data. You will consider how well they do this.

4. © Nuffield Foundation 2011 For more about ozone and the ozone hole: take the Ozone Hole Tour at http://www.atm.ch.cam.ac.uk/tour/readme.html http://www.atm.ch.cam.ac.uk/tour/readme.html watch a movie of the ozone hole at http://www.atm.ch.cam.ac.uk/tour/part2.html#oct http://www.atm.ch.cam.ac.uk/tour/part2.html#oct try an ozone crossword puzzle at http://www.epa.gov/ozone/puzzles/scipuzzl.html http://www.epa.gov/ozone/puzzles/scipuzzl.html