This nonfiction reading unit (level R) focuses on how Earthâ€™s continents and oceans change over time. Students learn that processes like earthquakes and erosion leave behind evidence of their occurrence in geographic features. The unit contains teacher support pages, a reading selection with supporting illustrations, and activities to guide students in close reading of the text. Students also gain practice applying content and academic vocabulary. The unit concludes with a lesson exploring text structure (Cause and Effect) and a text-based writing activity.