Around the world, 800 women die every day from preventable pregnancy-related causes – 99% of which occur in developing countries.
The tar sands, most of which occur in Alberta, are being extracted by the biggest opencast mining operation on earth.
Mercury, especially in its organic form, is an insidious poison, the effects of which occur slowly through continued exposure.
(One problem was that Google's algorithm was hoodwinked by meaningless correlations — between flu outbreaks and high-school basketball seasons, for example, both of which occur in winter).
These pages bristle with cocksure declarative sentences, many of which occur at the beginning of chapters, signaling what is to come with a clipped fanfare of ambiguous pronouncement.
The government believes this type of technology can dramatically reduce traffic deaths, most of which occur as a result of human error.
The motives for the deliberate poisonings, many of which occur in rural areas, are often the same sorts of grudges, feuds and animus that lead to killings everywhere.
Practicing physicians are only dimly aware of many of these disorders, some of which occur only once in as many as several hundred thousand births.
They are often responsible for unnecessary mule deaths, an average of ten to fifteen of which occur each summer, according to one Forest Service ranger's estimate.
The count's sedate life provides an ironic counterpoint to the grim doings of Bolshevik and Stalinist Russia, most of which occur out of sight.
Other minerals worked in Zambia include cobalt, gold, and silver, all of which occur in association with copper.
