If you only want to checkout one book this week, I would suggest that you get Science and Craft Projects with Wildlife , by Ruth Owen. Why? It includes the instructions on how to make crystal "rocks' using borax. This was one of my favorite things to do as a kid, and every child that I have shared it with, absolutely loves it!
Science and Craft Projects with Wildlife: The activities break no new ground: seed collages (Plants), rock sculptures (Rocks), leaf wreaths (Trees), and animal masks (Wildlife). Adult help is suggested for cutting, photographing, and mixing borax to make crystals (Rocks), but not for the plaster of Paris cast activity in each title except Plants.