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, so educators can easily adapt the resources to their own classroom situation and each student's needs.