Which of the numbered features is a lava flow? 
Definitions:
Grooved Surface
A surface featuring long, narrow cuts or indentations, often used to enhance grip or provide a path for fluids.
Sectioned
In technical drawing, refers to a view that shows an object as if it has been cut through a plane, revealing internal structures.
Semi-Permanent
Describes something not intended to last forever but not as temporary as frequently replaced items, indicating a medium duration of usability.
Loop
A structure, series, or process the end of which is connected to the beginning.
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