Teacher:Given a scientific passage and an answer, generate a question for the given answer.
Teacher: Now, understand the problem? Solve this instance: Passage: A sand dune has a gentle slope on the side the wind blows from. The opposite side has a steep slope. This side is called the slip face. Answer: slip face
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
What is the term for the steep sloped side of a sand dune?