- An "Ocean" is composed primarily of "Water." This means the relationship is based on the primary substance or material that constitutes it.
- A "Desert" is typically characterized by having vast expanses of "Sand." This is a defining component of most deserts.
- "Mountain" is unrelated to a desert as it represents elevated land and is not a basic component of a desert.
- "Wind" impacts deserts, but it isn't a fundamental material that composes them.
- "Wave" is closely related to water bodies like oceans and doesn't align with deserts.

**Option 1: Sand** is the correct choice as it is the material component of a desert.

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