Aoife,
Your planning for Aistear around the special-ness of Earth is great. You could include picture of different parts of Earth if you wanted – or lots of photos of the immediate school area if that is your focus and the children could also describe the pictures and tell you what they think is important or special about the area.
I reminds me of a radio station that I listened to when I lived in London. Each week the DJ would choose a different part of London and ask listeners to ring in with what made it special. I learnt a lot about other areas from listening.