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natural tunnel

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natural tunnel [′nach·rəl ′tən·əl]
(geology)
A cave that is nearly horizontal and is open at both ends. Also known as tunnel cave.


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The organizing committee chose Natural Tunnel State Park, located in SCTC's service area.
The natural tunnel is the next stage in the school's master-plan to transform its grounds into a wildlife haven.
The single-track trail offers a steady, relatively easy grade, trickling streams and natural tunnels of overhanging trees.
 
 
 
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