However, at the time of its occurrence, it was the sixth deadliest storm in the country.
Owing to its frequent occurrence, it is receiving considerable attention these days.
Elemental fluorine in Earth's atmosphere would easily react with atmospheric water vapor, precluding its natural occurrence; it is found only in combined mineral forms, of which fluorite, fluorapatite and cryolite are the most industrially significant.
In view of its widespread occurrence, it is not too surprising that GlcNAc has also been found to induce cell signaling in fungi and bacteria.
Because BFR is unique in terms of its large thickness (up to 30 cm) and widespread occurrence, it has been further investigated on both microscopic (Meneghini et al. 2010) and macroscopic (Rowe et al. 2011) scales.
In any individual occurrence it is hard to tell which factors play the most important role.
If the Bush dynasty were a freak occurrence, it might be amusing rather than disturbing.
It is becoming such a frequent occurrence, it is likely to have some very serious negative effects.
Seeing the "Yellow Sarah" may well have been a once in a lifetime occurrence: it will soon go into a private collection.
Illness is not an isolated occurrence; it happens in the context of our lives – to make sense of a disease, you have to understand the person.
Though seemingly a freak occurrence, it drew attention, partly because of the specific details: It happened on the hallowed grounds of Central Park, to a computer scientist, and pointed to a real, if distinctly remote, danger from above.
