In Slow Changes, Fast Changes children can learn how long does it take for mountains to form compared to how fast a forest grows. This book examines changes that occur naturally. Changes can happen slowly or they can happen quickly. 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.