Browse "Nature & Geography"

Displaying 781-800 of 895 results
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Sustainable Development

The WCED was formed to consider the key issues related to environment and development, and to provide feasible and innovative ideas to deal with them. Sustainable development was proposed to meet this challenge.

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Sutil and Mexicana

In 1792, after exploratory voyages by Spaniards Manuel Quimper (1790) and Francisco de Eliza (1791), the extent of Juan de Fuca Strait remained a mystery. Some still believed the strait held the entry to the fabled Northwest Passage.

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Swallow

The swallow (Hirundinidae) is a small family of birds including about 87 species worldwide, of which 7 breed in Canada.

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Swan

The swan is a large waterfowl with an elongated neck and narrow patch of naked skin in front of the eye.

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Sweet Apple

The sweet apple (Malus pumila) is a cultivated species of the rose family and Canada's most important tree fruit crop.

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Sweet Corn

Sweet corn (Zea mays var. saccharata or rugosa) is an annual vegetable of the grass family.

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Swift

Swift is a common name for about 100 species of birds in 2 closely related families (Apodidae, Hemiprocnidae).

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Tanager

The tanager (Thraupidae) is a family of small songbirds, possibly comprising as many as 413 species.

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Tantramar Marsh

Tantramar Marsh is one of 4 saltwater tidal marshes covering 20 230 ha on the narrow Chignecto Isthmus that connects New Brunswick and Nova Scotia. Its complex system of bogs, rivers, lakes and marshes once provided a

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Termite

Termites are social insects of the infraorder Isoptera. They may be thought of as “social cockroaches,” as they evolved from their wood-eating cockroach ancestors approximately 200 million years ago.

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Tern

 The tern is a medium-sized bird of the GULL family. Terns are usually grey and white; in spring and summer most species have a black cap. Similar to gulls in appearance, terns differ in having more pointed wings and usually a noticeably forked tail.

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Thistle

The thistle (Carduaceae tribe, family Compositae or Asteraceae) is a spiny herbaceous plant with white or purple flowers. There are 800 species worldwide, 46 in Canada (15 native). Native species (none serious WEEDS) are mainly "true" or "plumed" thistles of genus Cirsium.

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Thrasher

Thrashers (Mimidae) are a small family of slender, long-tailed, medium-sized, insectivorous and frugivorous birds with loud, musical, repetitive songs.

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Thrips

Thrips, order Thysanoptera (Gk for "fringe-wings"), are among the smallest insects, being slender and usually less than 2 mm long.

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Thrush

Thrushes (Muscicapidae) are a very large family comprising about 450 species of small passerines (perching birds) ranging 11-33 cm in length.

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Thunderstorm

Thunderstorms usually occur on summer afternoons. While a thunderstorm typically affects a given locality for only an hour or so during its passage overhead, the entire lifetime may be as long as 6-10 hours, along a pathway of several hundred kilometres.

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Tick

Tick is a common name for a group of external bloodsucking parasitic arthropods of vertebrates (mainly of terrestrial mammals and birds).