We started our first grade unit on matter by observing and exploring different kinds of solids.  We brainstormed different kinds of vocabulary words we could use to describe these solids, and sorted them into various groups.  We spoke about the shape, texture, size, color, etc…  After a few days of exploration, the students were given a solid challenge!  They were asked to use all of the solids given to them to create the tallest tower they could.  The students had to think about the different properties of each solid to determine where on the tower they should place each item.  They had a blast creating towers by thinking about the properties of solids!