Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Not all climate regions develop soils. Arid regions are poor at soil development. Not all regions develop the same soil horizons. Some areas develop as many as five or six distinct layers. Others develop only a few. Answer: soil
While some climate regions have multiple layers, arid regions are poor for development of what?