GENERAL KNOWLEDGE

Detailed explanation-1: -Emissions in the United States can result in acid rain in Canada, threatening timber and water resources. Companies and factories dispose of harmful waste, such as heavy metals and pesticides, into water sources.

Detailed explanation-2: -Many of the waters (streams, rivers, ponds, and lakes) and soils in Canada lack natural alkalinity, such as a lime base, and cannot neutralize acid naturally. Provinces that are part of the Canadian Precambrian Shield, such as Ontario, Quebec, New Brunswick, and Nova Scotia, are most affected.

Detailed explanation-3: -Between 1972 and 1977, evidence linked acidification to the long-range transport of sulphur dioxide from sources in other countries-for Scandinavia, nations of continental Europe, and for Canada, the United States; within Canada there was also long-range transport between provinces.

Detailed explanation-4: -Acid rain is a problem in eastern Canada because many of the water and soil systems in this region lack natural alkalinity-such as a lime base-and therefore cannot neutralize acid naturally.