natural tunnel

natural tunnel

[′nach·rəl ′tən·əl]
(geology)
A cave that is nearly horizontal and is open at both ends. Also known as tunnel cave.
References in periodicals archive ?
The lava probably drains leaving a natural tunnel behind.
Before taking up his studies at ETSU at the end of August, Cameron is attending a band camp at Duffield, Virginia which is part of the Natural Tunnel State Park.
Bardunias & Su (2005) suggested that because natural termite tunnel networks are excavated within a limited soil horizon, a planar arena might allow for a more natural tunnel expansion than a volume of soil that is deeper but with limited lateral distance.
A long flight of steps leads to a level stretch and, after a natural tunnel formed by trees, we walk between fences.
This "rock landscape" was fashioned to offer spiderlings enough supports to construct their webs, and the rolled leaf was offered as a "natural tunnel." Two to four webs constructed by spiderlings from 3rd to 6th instars were lightly coated with cornstarch and then photographed.
The organizing committee chose Natural Tunnel State Park, located in SCTC's service area.
Jones says that in fact, the Ark was brought through a secret passage beneath the mount - and that same natural tunnel in fact continues 18 miles into the Judean Desert.
One says they travel to and from Morocco via a natural tunnel running through The Rock and under the Straits of Gibraltar, and another that if they ever leave the colony, Gibraltar will no longer be British.
Paddling along in my inflatable sea canoe, it felt as if I were in a natural tunnel of love, stalactites hanging just an inch above my head.
The natural tunnel is the next stage in the school's master-plan to transform its grounds into a wildlife haven.
"There are lava tubes on our property," he said referring to the natural tunnels underground that drain lava during an eruption.