Browse "Nature & Geography"

Displaying 646-660 of 933 results

  • Article

    Pickerel

    Pickerel, common name for 3 closely related carnivorous, soft-rayed freshwater fishes in the pike family (Esocidae).

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  • Article

    Pigeon

    The pigeon (Columbidae) is a large family (303 species) of birds, many of which are called doves, distributed throughout temperate and tropical areas worldwide.

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  • Article

    Pika

    Pika is a common name for the smallest members of the order Lagomorpha, which also includes rabbits and hares.

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  • Article

    Pike

    Pike is the common name for the group of 5 species of predaceous freshwater fish with elongated snouts, sharp teeth, cylindrical bodies and forked tails, belonging to family Esocidae, order Esociformes, class Actinopterygii.

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  • Article

    Pine Trees in Canada

    Canada is home to 10 species of pine trees. Distinguishable by their bundles of two, three or five needles, various species can be found throughout Canada’s provinces and the Yukon and Northwest Territories. These conifers can live for hundreds of years, with the oldest pine tree in the world being around 4,900 years old and located in Nevada. Two pine species are designated provincial trees in Canada: the lodgepole pine in Alberta and the eastern white pine in Ontario.

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  • Article

    Pingo

     A pingo is an ice-cored hill typically conical in shape, growing and persisting only in PERMAFROST. The word "pingo" is of Inuit origin and was first used in the English-language literature by the botanist Alf E.

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  • Article

    Pipelines in Canada

    Pipelines are systems of connected pipes used to transport liquids and gases — namely oil and natural gas — across long distances from source to market. More than 840,000 km of pipelines criss-cross the country. They represent part of the oil and gas sector which directly and indirectly employs approximately 740,000 people. According to Natural Resources Canada, the sector earns the government an average of $20 billion in royalties, fees and taxes each year (see Natural Resources in Canada). It also contributes nearly 11 per cent of Canada’s gross domestic product. Pipelines, however, have been controversial in Canada. Pipelines help transport fossil fuels and research indicates that fossil fuel use, is significantly contributing to climate change. In recent years, Indigenous groups, environmentalists, municipalities and labour unions have opposed numerous pipeline projects due to the risk of contaminated local waterways from spills and leaks. (See also Environmental Movement in Canada).

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  • Article

    Pipit

    Pipit is the common name for some birds of the family Motacillidae, which also includes wagtails. 

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  • Article

    Pitcher Plant

    Pitcher plant is the common name for certain perennial herbs adapted to wet, marshy and boggy habitats low in nutrients. They have rosettes of leaves that are modified into tubular, trumpet-like structures filled with liquid that function as insect traps. The plants generally bear a single, large nodding flower. Canada is home to only one species, the purple pitcher plant (Sarracenia purpurea).

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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

    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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    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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    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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    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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