Classification (natural vs man-made phenomena/objects): Three are natural entities/phenomena; one is a human-made machine. Identify the odd one out.

Introduction / Context:
World-knowledge classification frequently separates natural objects and phenomena from artificial constructs. River (natural watercourse), Earth (natural celestial body), and breeze (natural movement of air) are all natural. An aeroplane is a human-engineered machine designed for flight. The natural vs man-made boundary provides the intended odd-one-out contrast.

Given Data / Assumptions:

• River → natural geographic formation.
• Earth → natural planet.
• Breeze → natural atmospheric phenomenon.
• Aeroplane → man-made vehicle/machine.

Concept / Approach:
Partition by origin: natural vs artificial. Exactly one entry is artificial, so it becomes the outlier under the standard 3:1 structure used in reasoning questions.

Step-by-Step Solution:

Verification / Alternative check:
Consider whether the item exists without human intervention. Aeroplanes require design and manufacture; the other three exist independently of humans.

Why Other Options Are Wrong:

Common Pitfalls:
None; this is a direct natural/artifact split.

Final Answer:
Aeroplane