bubble train

bubble train

[′bəb·əl ‚trān]
(geology)
A string or strings of vesicles in lava, indicating the path of rising gas escaping a flow of lava.
References in periodicals archive ?
The result is a bubble train, the collapsed tube of oxide as a crack resembling an old sack.
If youare drinking good Champagne you should see whatas called acollerettea a these are bubble trains on the sides of the glass.
The bubbles typically contain carbon dioxide gas and in both beverages form rapidly ascending, similar-looking bubble trains.