This is a collection of five lessons to help students understand solids, liquids, and gases. I have leveled these lessons between 1st-3rd grades. The initial lesson begins by allowing you to choose between having students sort picture cards with labels of solids and liquids or solids, liquids, and gases. These cards are perfect for early readers and ELL students. The lessons then progress to discuss observable properties, molecules, cooling and heating, and changes. All lessons are aligned with NGSS and easy to use.