Science A-Z units are distributed across four scientific domains: Life, Earth & Space, Physical, and Process Science.
Life Science Resources: Teach students about the living world around them and how organisms interact with one another.
Earth and Space Science Resources: Teach students about features, materials, and processes on Earth and in outer space.
Physical Science Resources: Teach students about the nature and properties of energy, forces, and matter.
Process Science Resources: Teach students about the skills and tools necessary to conduct investigations and find answers.
Units are split into three grade ranges (K-2, 3-4, and 5-6) based on the grade at which the topic is taught in most US states. Within each unit, reading materials are available at three levels of text complexity: low •, mid ••, and high •••. This allows for differentiated and flexible instruction, enabling educators to adapt the resources to their classroom situation and each student's needs.