iPad apps - EARTH

1. Sun seeker - £4.99

2. ARCTIC WATCH - Free/£0.69 - Ice melting stats - live updates

3. EARTHOBSERVER - £0.69 - explore maps detailing ice sheets, ocean salinity, human footprint indexes, or atmospheric composition etc.

4. THE ROCK CYCLE - Free - Interactive story of the life of a rock, lots of shaking required.

5. LEAFSNAP - Free - Identifies leaf species from photos.

6. EARTH VIEWER - Free - geological periods, continents positions, oxygen, carbon dioxide