Browse "Nature & Geography"

Displaying 31-45 of 933 results

  • Article

    Aphid

    Aphids are small, soft-bodied insects that suck plant sap. They belong to the order Hemiptera and the suborder Sternorrhyncha (along with whiteflies, scale insects and jumping plant lice). Aphids belong to the family Aphididae, although many species in the families Adelgidae and Phylloxeridae are also commonly called aphids. Over 5,000 species are known worldwide, over 800 of which are found in Canada. Aphids originated at least 250 million years ago, but most of their present diversity arose in the last 66 million years alongside flowering plants. Their great success as a group has made them familiar and prolific pests of gardens and agricultural crops.

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  • Article

    Apricot

    Apricot is the common name for certain members of genus Prunus of the rose family, which produce sweet, round or oblong, nearly smooth fruit (resembling a small peach), with a large, flat stone. 

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  • Article

    Arachnida

    Arachnida is a large class of chelicerate arthropods (segmented, jointed-limbed animals) including the orders Araneae, Scorpiones, Opiliones, Pseudoscorpiones, Solifugae and the subclass Acari.

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  • Article

    Arboretum

    Representative specimens are usually labelled with their common and scientific names, family name and the country of origin may appear as well. The parents of hybrids may also be indicated.

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  • Article

    Arctic Animals

    Arctic animals are those that have adapted physically and behaviourally to the particular conditions of life in the most northerly regions on the planet.

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  • Article

    Arctic Exploration

    Humans have been exploring the North American Arctic for centuries, beginning about 5,000 years ago when Palaeo-Inuit were looking for a homeland, followed by the early Inuit (Thule) — ancestors of the Inuit. European exploration of the same region began with the Norse in the 10th century and, after a short pause, was continued by Englishmen during the Elizabethan era (1558–1603). Over the next several hundred years, explorers ventured to the Arctic in search of resources, scientific knowledge, national prestige, personal fame and a navigable Northwest Passage. The most successful of these explorers adapted to the harsh Arctic environment and adopted the tools and practices of northern Indigenous peoples.

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    Arctic Haze

    Once one of the purest and cleanest places on Earth, the Arctic has been tarnished, dimmed by a dirty blanket of reddish-brown smog. Coined in the 1950s, the arctic haze which arrives each fall and winter is a totally unexpected phenomenon recorded nowhere else on Earth.

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    Arctic Oceanography

    The Subarctic covers a relatively large area in eastern Canada; its western counterpart, formed where Pacific and Arctic waters meet and mix, is restricted to a narrow band along the shore of the Beaufort Sea (see Coastal Waters).

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    Canadian Arctic Sovereignty

    Arctic sovereignty is a key part of Canada’s history and future. The country has 162,000 km of Arctic coastline. Forty per cent of Canada’s landmass is in its three northern territories. Sovereignty over the area has become a national priority for Canadian governments in the 21st century. There has been growing international interest in the Arctic due to resource development, climate change, control of the Northwest Passage and access to transportation routes. As Prime Minister Stephen Harper said in 2008, “The geopolitical importance of the Arctic and Canada’s interests in it have never been greater.”

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  • Article

    Arthropoda

    Arthropoda, phylum of bilaterally symmetrical animals having external skeletons (exoskeletons), multisegmented bodies and paired, jointed appendages. 

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  • Article

    Artiodactyla

    Artiodactyla is an order of even-toed mammals that walk on their toenails (unguis). This and the other order of hoofed mammals, the Perissodactyla, are collectively called ungulates.

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  • Article

    Asbestos (Mineral)

    The name asbestos comes from a Greek word meaning "inextinguishable" (often mistaken to mean "incombustible"). Asbestos is a collective term that is used to designate 2 separate groups of silicates: the serpentine group and the amphibole group.

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  • Article

    Ash

    Ash (Fraxinus), genus of trees or shrubs of olive family (Oleaceae). About 60 species occur worldwide, primarily in cold temperate regions; 4 are native to Canada.

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  • Article

    Asparagus

    Asparagus (Asparagus officinalis) is a perennial vegetable of the Lily family. Of Eurasian origin, asparagus was grown for food and medicinal purposes over 2000 years ago.

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  • Article

    Aspen

    Aspen, deciduous, hardwood tree in genus Populus of Willow family. Trembling (quaking) aspen (P. tremuloides) and largetooth aspen (P. grandidentata) are native to Canada.

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