Nature & Geography | The Canadian Encyclopedia

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  • Article

    Racoon

    Racoon was a 26-gun British sloop of war sent to seize Astoria, the American Pacific Fur Company post at the Columbia River mouth, and to establish an outpost there during the War of 1812.

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  • Article

    Radish

    Radish (Raphanus sativus) is a hardy annual or biennial vegetable belonging to the Cruciferae family. Roots are mostly rounded with a red exterior and white, acrid flesh. 

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  • Article

    Ragweed

    Ragweed is an annual or perennial plant of the genus Ambrosia, family Compositae or Asteraceae. Fifteen species are native to North America; 3 occur across Canada: common ragweed (A. artemisiifolia), perennial ragweed (A. coronopifolia) and giant ragweed (A. trifida).

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  • Article

    Rail

    Rail is the common name for some members of the rail family (Rallidae) of birds.

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  • Article

    Rain

    Central US lows, entering Canada somewhere between Manitoba and Québec, are of major environmental significance because they pass through the industrial heartland of the US and frequently bring ACID RAIN.

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  • Article

    Rainbow

    A rainbow is a coloured arc that occurs when sunlight shines onto falling raindrops and is refracted, then reflected back towards the observer. In this process, each drop acts as a tiny prism, splitting the sun's rays (according to wavelength) into their component colours.

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  • Article

    Rainfall Extremes

    The amount of rain or snow that reaches the ground can vary dramatically on any particular given day, even over short distances. Many people have experienced a near-deluge of rain in their backyard, while at the same time their front yard or their neighbour's home remains quite dry.

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  • Article

    Rat

     Rat is a common name for certain mammals of order Rodentia, family Muridae.

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  • Article

    Rat Control in Alberta

    Rat control in Alberta is administered and co-ordinated by Alberta Agriculture and Food. It was established in 1950 to keep Alberta free of Norway rats (seeRAT), which were introduced to the east coast of North America in 1775

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  • Article

    Rattlesnake

    Rattlesnake is the common name for about 30 species of venomous, viperid snakes in the genera Crotalus and Sistrurus, found from southern Canada to South America. Three species of rattlesnake are found in Canada: the Western rattlesnake (Crotalus oreganous), the prairie rattlesnake (Crotalus viridus) and the Eastern massasauga rattlesnake (Sistrurus catenatus). Another species, the timber rattlesnake (Crotalus horridus) is extirpated, meaning the species no longer exists in the wild in Canada, but lives elsewhere.

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  • Article

    Raven

    The raven is a large, black bird with a purplish lustre, belonging, like the crow, to the genus Corvus.

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  • Article

    Ray

    Description Rays are flattened dorsoventrally, the body appearing disclike. The pectoral fins are attached to the side of the head. The mouth, nostrils and 5 pairs of gill slits are located on the white lower surface. A pair of spiracles occurs on the upper surface behind the eyes.

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  • Article

    Red Fife Wheat

    Red Fife is a bread wheat (Triticum aestivum) variety that Dave Fife and family began to grow in 1842 at their farm in Peterborough, Ont. 

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  • Macleans

    Red River Flood

    This article was originally published in Maclean’s magazine on May 12, 1997. Partner content is not updated. The flood of the century, they have been calling it in Manitoba, an awesome demonstration of nature’s raw might.

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  • Article

    Reforestation

    Many people believe a new sapling must be planted to replace every tree that is harvested. In fact, the FOREST regenerates naturally. After logging, young shoots grow and develop quickly because they have more room and good exposure to sunlight.

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