area

Deductions

• Earth's surface has quality area ⇐ (Earth's surface is a physical surface), (physical surface has quality area)
• planetary surface has quality area ⇐ (planetary surface is subclass of astronomical object's surface), (astronomical object's surface has quality area)
• astronomical object's surface has quality area ⇐ (astronomical object's surface is subclass of physical surface), (physical surface has quality area)