In About How Big? teach children to understand how to measure the relative sizes and weights of each other, and more precise means of measurement. In this title and the acompanying materials, terms such as exact, accurate and laser are introduced, among other concepts. ELF Science books are written to correspond with Next Generation Science Standards. This advanced Level (Green) covers the recommended content for 2nd grade students. This advanced level of science bundle for students features a book with beautiful photographs that discusses the featured topic, glossary, quizzes, vocabualry, and games. On page Spanish language support is available by tapping the globe in the bottom right hand corner. On page parent support is available by tapping the handholding icon in the bottom right hand corner. Each word on the page is tappleble for beginning readers. Users can also tap the play button to hear the text read aloud. Downloadable PDF Teacher Resources contains: pre and post tests, 3 teacher cards (task, read, ELL), family time flyer in english and spanish, and rewards for hardworking students.