This paired text social studies unit focuses on helping students answer this Big Question: How did we figure out what our world looks like? This unit contains two lessons and a unit assessment. Each lesson includes teacher support pages, a dictionary, a reading selection, and a variety of written and oral activities, including reading comprehension, close reading, vocabulary, and text-based writing activities. The reading selections in this unit are: Putting the Pieces Together (Level P) and The Edge of the World (Level O). An answer key is also included.