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Lead

Lead is extracted from mined ores containing zinc, silver and minor amounts of copper. It is also recovered from recycled materials; more than 50% of world metal production comes from recycling, making lead one of the most recycled metals in the world.

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Biogeography

Ecology is subdivided into 3 fields of study: autecology (relations of individual species or populations to their milieu), synecology (composition of living communities) and dynecology (processes of change in related communities).

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McKee Trophy

 McKee Trophy, award given annually for contribution to the advancement of Canadian aviation. It was donated by J. Dalzell McKee, an American sportsman pilot, who completed the first flight of a seaplane across Canada in 1926.

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Medical Jurisprudence

Medical jurisprudence, broadly defined, covers the relationship between a patient and a health-care provider such as a doctor, nurse, dentist, physiotherapist, or even an institution such as a HOSPITAL.

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Metropolitan-Hinterland Thesis

The Metropolitan-Hinterland Thesis is a theory of historic relations between a large, powerful urban community (metropolis) and the surrounding territory (hinterland) which the metropolis dominates through mainly economic means. Formulated by economic historian N.S.B.

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Malaria

Early settlers in Ontario experienced a disease called "fever and ague," which ravaged the first European settlements such as Newark [Niagara-on-the-Lake] and Cataraqui [Kingston].

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Medicine Wheels

The term medicine wheel is not an Aboriginal term, but was initially used around the turn of the century by Americans of European ancestry in reference to the Bighorn Medicine Wheel located near Sheridan, Wyoming. Later archaeological research on the Plains Aboriginal people identified other features characterized by a variety of stone circle, cairn and spoke configurations. Because of general similarities to the Bighorn Wheel, the term medicine wheel was extended to describe them as well.

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Mary Celeste

Mary Celeste was a brigantine built in 1861 at Spencer's Island, Nova Scotia, and originally named Amazon. She was wrecked off Cape Breton in 1867, salvaged, sold and in 1868 registered at New York and renamed Mary Celeste. In 1872 she was found adrift off the Azores, with no sign of her crew.

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Metamorphic Rock

Metamorphic rock is one of the 3 major classes of rock comprising the Earth's crust, the others being SEDIMENTARY and IGNEOUS ROCKS. Metamorphic rock has been transformed, while in the solid state, by pressure, temperature and deformation.

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Medical Drug Abuse

Although medicines have been misused for as long as they have been available, a universally accepted definition of the term "drug abuse" does not exist.

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Mackenzie Valley Pipeline Proposals

In 1970, the Canadian government introduced guidelines for the development of a pipeline corridor south from the Mackenzie River delta to Alberta and the United States. Energy companies have since proposed three separate projects to transport natural gas by pipeline along this route — the Arctic Gas Pipeline, the Foothills Pipeline and the Mackenzie Gas Project — with an oil pipeline likely to follow in the first two cases. However, due to high costs, engineering challenges, environmental concerns, Indigenous land claims and changing markets, none of these pipelines has been built.

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Mackenzie Highway

Eighty km northwest of Enterprise, a ferry connects with the highway to Yellowknife, and connecting roads to the east serve Fort Resolution and Fort Smith. The section from Enterprise to Hay River is now a separate highway. First built as an all-weather road, some of its length has been paved.