After reading a book about matter to our first graders, we completed a vocabulary building activity. When we introduce new vocabulary to our kiddos we usually complete a worksheet like the one below. Our first graders put these worksheets in their writing binders and refer to them when needed.
This is a cut & paste book on the three states of matter. Each page of the book gives on explanation of a solid, liquid, and gas. Students are to determine if the pictures are solids, liquids, or gases. They paste the pictures on the pages to create a book! This is a great follow up activity after your lesson matter.