Canadians used to be complacent about the purity of their drinking water. Then came the wake-up call at Walkerton.
by Gary Nyp "Reprinted with permission from the University of Waterloo Magazine, Fall 2000."
Until recently, Walkerton was a tranquil southwestern Ontario town, a friendly, vibrant tourism hotbed known for its quaint shops, nature trails, and canoe trips along a serpentine Saugeen River abundant with trout, bass, and salmon.
Some people have streets named after them. Some, parks. Some, towns. Some, mountains.
University of Saskatchewan Geology Prof. William Sarjeant found out quite by accident the other week he has been immortalized in a very special place -- at the bottom of the Atlantic Ocean. And he couldn't be more thrilled.
Dirk Schmid, M.Sc.
Ryerson Polytechnic University, Toronto
Finding a well-designed internet website with interesting and useful information on the earth sciences can be a frustrating exercise. Many existing websites offer content of little use to children, parents and teachers, or they are poorly organized, or they don't work properly. Websites focusing on Canadian content are few and difficult to find.
Gypsum, hydrated calcium sulphate, Ca SO4.2H2O is a common mineral formed mainly by the evaporation of sea water. Known from antiquity, its name comes from the Arabic jips, for "plaster," then to the Greek gypsos, for chalk.
Gypsum can be found as thick layers in shale and as attractive crystals.