Rock fragments and particles ejected by a volcanic eruption.
- ‘Some reports are stating that that tephra rim could collapse later this year.’
- ‘Two types of tephra fallout deposits have been observed.’
- ‘Southwesterly winds carried the tephra northeast and destroyed a few tens of farms.’
- ‘Any such lateral motions could contribute to the absence or thinness of distal marine tephra layers on submarine high points or steep slopes.’
1940s: from Greek, literally ‘ash, ashes’.
We take a look at several popular, though confusing, punctuation marks.