The remnants of volcanic tubes on the moon whose roofs have capsized and a trench or valley is created is called a rille system, which is a groove or long narrow depression on the lunar surface. From Wordnik.com. [The Hindu - Front Page] Reference
A sinuous rille ran off to the left, like a dry stream bed. From Wordnik.com. [Moonwar]
A new rille might have opened up only a few thousand years ago. From Wordnik.com. [Moonwar]
The prints down inside the rille were faint, but still visible. From Wordnik.com. [Moonwar]
Two big ones and six little ones; how difficult could it be to find the rille?. From Wordnik.com. [Who Do You Say I Am] Reference
Staying on the surface, Doug followed the rille as it wound across the regolith. From Wordnik.com. [Moonwar]
He saw a rille snaking off to the left, like a narrow riverbed waiting for water. From Wordnik.com. [Moonwar]
As far as he could see there were no prints on the other side of the narrow rille, either. From Wordnik.com. [Moonwar]
Slowly, bending over the edge of the rille to examine its bottom, Doug started backtracking. From Wordnik.com. [Moonwar]
The rille had been getting progressively deeper, sinking more than four meters below the crater floor, Doug guessed. From Wordnik.com. [Moonwar]
They had come across a rille that had suddenly spurted a ghostly cloud of gasses from deep within the lunar interior. From Wordnik.com. [Moonwar]
He backtracked a few steps, then saw that Gordette had climbed down into the shallow gully cut into the ground by the rille. From Wordnik.com. [Moonwar]
It took the better part of an hour to get them both out of the rille and their air tanks topped off from the tractor's supply. From Wordnik.com. [Moonwar]
He came to a spot where a meteoroid had slammed into the ground just next to the rille, collapsing its side into a heap of rubble. From Wordnik.com. [Moonwar]
Soon, though, Gordette's trail started to run beside a sinuous rille that snaked along the dusty ground like an arroyo in desert country. From Wordnik.com. [Moonwar]
Slowly, moving cautiously along the slippery rock floor of the rille, both hands extended to touch its steep confining walls, Doug made his way forward. From Wordnik.com. [Moonwar]
The hole is 65 meters in diameter and is located in the volcanic Marius Hills region on the near side of the moon, right in the middle of a long sinuous rille. From Wordnik.com. [Kaguya Discovers a Lava Tube on the Moon | Universe Today] Reference
It seemed to take an eternity and a half for Edith to find the tow cable and then clamber down into the rille behind Doug and tie it to one of the attachment rings on his backpack. From Wordnik.com. [Moonwar]
"It looks like once we round this bend we've got another two side canyons, plus half a dozen smaller channels to go past, and then we can head up the rille and straight out for Pavonis.". From Wordnik.com. [Who Do You Say I Am] Reference
While it looks very artificial with limited aperture and possibly like it could have been formed by a glancing blow from a small asteroid, it's actually a volcanic/tectonic feature called a sinuous rille. From Wordnik.com. [Santa Spied at Lunar North Pole… | Universe Today] Reference
With great reluctance, and more than a little fear, Doug carefully climbed down inside the rille, lowering himself slowly down as far as he could with his arms fully stretched, then letting himself slide the rest of the way down. From Wordnik.com. [Moonwar]
He spent the next quarter kilometer anticipating Bentley's apology when they arrived at the correct rille, but his expectations fizzled when they rounded the bend and saw a debris-choked water channel that not even a Sandship could navigate. From Wordnik.com. [Who Do You Say I Am] Reference
The valley floor is a flat, lava-flooded surface that is divided by a slender, cleft-like rille. From Wordnik.com. [Universe Today] Reference
It sits in the middle of a rille, suggesting the hole leads into a lava tube as wide as 370 metres across. From Wordnik.com. [Science Fiction in the News] Reference
In a horizontal tubular structure, however, any lunar vehicle can just move along the rille into the tunnel structure for safe parking. From Wordnik.com. [The Hindu - Front Page] Reference
Over time, similar smaller strikes formed the many craters around its edges and lava flow gradually gave the area the ridge - and rille-covered floor we see tonight. From Wordnik.com. [Universe Today] Reference
CarTop's take on the facelift Legacy includes a rille up front combined with minor changes to the rear and most importantly, an Audi-like waist-line and pop-out door handles. From Wordnik.com. [Refinance 2nd Mortgage] Reference
"Begging your pardon, sir, but it's a rille, not a canyon. From Wordnik.com. [Who Do You Say I Am] Reference
We'll go a bit more westerly than we'd originally planned, but I've found a rille that leads northward again and should put us back on the plains just about the time the storm lets up. ". From Wordnik.com. [Who Do You Say I Am] Reference
Down inside the rille. From Wordnik.com. [Moonwar]
Why'd he jump down into the rille?. From Wordnik.com. [Moonwar]
But between her feet the ground formed a rille. From Wordnik.com. [November 2008] Reference
This rille must be brand-new, maybe still active. From Wordnik.com. [Moonwar]
'joha EwcH, Md Hie iacet JoHANHBsEwzt, quondam fuller iftius rille n Agnes rxor Acoti u, wift. gj „ s qui quidem Johannes obijt Ti 0£tobris anno doim M.ccccxxxvi. liters dominicalis G. From Wordnik.com. [Antient funeral monuments, of Great-Britain, Ireland, and the islands adjacent] Reference
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