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  • Macleans

    Plan to Remake Canada

    The new Maritime quest for unity began during those achingly anxious hours when Quebecers counted their ballots and decided the fate of the entire country. As the tally in last October's referendum seesawed back and forth, Liberal MP George Rideout, a former mayor of Moncton, N.B.This article was originally published in Maclean's Magazine on February 5, 1996

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  • Macleans

    Plane Crash in Fredericton

    This article was originally published in Maclean’s magazine on December 29, 1997. Partner content is not updated. Like thousands of other Canadians last week, Krista Kitchen was headed home for the holidays. Flying into Fredericton from Toronto aboard Air Canada Flight 646, the 23-year-old University of Western Ontario student was looking forward to Christmas with family and friends.

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  • Article

    Planet and Satellite

    The diameter of a world is a significant value because, given the same densities, the surface gravity will vary roughly with the diameter. A diameter of 350 km is the approximate dividing line between the larger, near-spherical bodies and the smaller objects of irregular shape.

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  • Article

    Plank House

    Historically, plank houses were structures built by various Indigenous peoples on the Northwest Coast of Canada, such as the Coast Salish, Kwakwaka’wakw, Nuu-chah-nulth, Nuxalk, Haida, Tsimshian, Gitxsan and Nisga'a. Plank houses varied in size and design, depending on the community. Plank houses still exist in some communities and are used mainly for community and ceremonial purposes. (See also Architectural History of Indigenous Peoples in Canada.)

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  • Article

    Plankton

    Plankton [Gk planktos, "drifting"], plants and animals , phytoplankton and zooplankton, respectively, that float freely or drift with currents in oceans , freshwater ponds and lakes. 

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  • Article

    Plant

    The shoot system (stem and leaves) grows upward into the light and is the site of photosynthesis; the root system penetrates the soil, anchors the plant and absorbs necessary water and minerals.

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  • Article

    Plant Breeding

    Plant breeding is an applied science, in which knowledge of genetics, pathology, plant physiology, statistics, and molecular biology are used to modify plant species for human needs or preferences.

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  • Article

    Plant Classification

    Popular classification usually divides living beings into plants and animals and, sometimes, microbes. Scientific classification long followed a similar system, with 2 principal kingdoms: the animal order and the vegetable order. 

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  • Article

    Plant Disease

    Plant disease can decrease the economic, aesthetic and biological value of all kinds of plants. Plant pathology (phytopathology) is the study of the nature, causes, prevention and socioeconomic aspects of plant diseases.

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  • Article

    Plant Gene Resources of Canada

    Plant Gene Resources of Canada (PGRC) is part of Agriculture and Agri-Food Canada. As Canada’s national seed gene bank it protects, preserves and enhances the genetic diversity of Canada’s important agricultural plants and their wild relatives (see Genetics; Seed Plants). Since its foundation in 1970, PGRC has played a major role in protecting Canada’s agricultural crops (see Agriculture in Canada). In doing so, it also helps protect biodiversity, which is disappearing in many places, and contributes towards food security at home and around the world. (See also Food insecurity in Canada.) Click here for definitions of key terms used in this article.

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  • Article

    Traditional Plants and Indigenous Peoples in Canada

    Indigenous peoples in what is now Canada collectively used over a 1,000 different plants for food, medicine, materials, and in cultural rituals and mythology. Many of these species, ranging from algae to conifers and flowering plants, remain important to Indigenous communities today. This knowledge of plants and their uses has allowed Indigenous peoples to thrive in Canada’s diverse environments. Many traditional uses of plants have evolved to be used in modern life by Indigenous and non-Indigenous peoples alike. (See also Indigenous Peoples’ Medicine in Canada.)

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  • Article

    Plastics-Processing Industry

    Plastics are based on giant molecules (polymers) which have a structure so ordered that they can be shaped at elevated temperatures and pressures, ie, these long-chain polymers exhibit "plastic flow" when heated.

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  • Article

    Plate Tectonics

    Plate tectonics is the theory proposing that Earth’s outer rocky shell is divided into seven major and several smaller rigid plates. Forces generated by heat losses from the planet’s interior constantly move the plates about. Plate movements, ongoing over millions of years (see Geological History), open and close ocean basins, generate volcanoes, raise mountains, facilitate accumulation of mineral and petroleum deposits, and influence evolution and climate change. Friction between plates prevents steady motion and stores energy that is released in sudden movements, causing earthquakes. This article is the full-length entry about plate tectonics. For a plain-language summary, please see Plate Tectonics (Plain-Language Summary). 

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  • Article

    Plate Tectonics (Plain-Language Summary)

    Plate tectonics is the theory that rocky plates divide Earth’s surface. The plates move as Earth releases heat from its interior. The movement of plates creates volcanoes and mountains and causes earthquakes. This article is a plain-language summary of Plate Tectonics. If you are interested in reading about this topic in more depth, please see our full-length entry, Plate Tectonics.

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  • Article

    Platinum

    Platinum (Pt) is the best known of the 6 greyish-white, metallic, platinum group elements, which also include palladium (Pd), iridium (Ir), rhodium (Rh), osmium (Os) and ruthenium (Ru). Platinum and palladium are more commonly used than the other elements in the group.

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