KS2 National Curriculum Science - Gases Around Us (5C) CGP Books
This book contains a variety of question types covering everything 9-10 year old pupils need to know about air and gases, following the National Curriculum for science. It's clearly laid out with a topic per page, written in a style that is easy to understand with plenty of space for writing answers. Pull-out answers are included and there's a poster on gases around us for pupils to colour in.