How does precipitation change desert landscapes? Objective Students will be able to: • use the word precipitation to describe rainfall. • observe the effect of floodwater. • make a hypothesis, observation, then a conclusion with given data. • record and make conclusions about how canyons form. • describe and analyze how rainfall can affect landforms. Background Lesson Overview: Students will explore precipitation through discussion, videos, and a PowerPoint presentation. For the lab activity, students will explore the way flood waters can affect the landscape and topography in the desert. Stud Duration: 60 Minutes.