BOOMLET Learning Science was designed to be implemented flexibly in your classroom. Each unit is organized around the topical arrangement of the Next Generation Science Standards. This arrangement focuses on science as a coherent storyline, rather than blocking science into the typical disciplinary areas. This helps students see that science is an interconnected subject in which phenomena are explored from a variety of viewpoints. Each section of this unit is anchored with a performance task to be completed by students working in small groups. These serve as the assessment of the unit and can be evaluated using the Evidence Statements of the NGSS.