Browse "Nature & Geography"

Displaying 821-840 of 900 results
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Trilobite

Trilobitesare an extinct marine arthropod of the Palaeozoic era (544-300 million years ago). Its closest modern relative is the horseshoe crab.

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Triticale

Triticale (Triticosecale Wittmack), the first man-made crop species, is initially produced by crossing wheat (genus Triticum) with rye (Secale), and resembles wheat.

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Trout

Trout is the common name given to the species of freshwater fish from 3 genera, all members of the salmon family (Salmonidae).

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Tsunami

In the deep ocean a tsunami travels at about the speed of a commercial jetliner and its length from crest to crest can be 100 km or more, but its height will be less than a metre and therefore it will not be noticed by ships at sea.

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Tuna

The tuna is a swift, elegant marine fish of class Actinopterygii, order Perciformes, family Scombridae (mackerels).

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Tungsten

Tungsten (W), also called Wolfram, lapis ponderosus or Heavy Stone, is a silver-grey metallic element with the highest melting point of any metal (3410° C). Tungsten has a high density, high strength at elevated temperatures and extreme hardness.

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Tunnels

Unlike other mountainous countries such as Switzerland, and despite its size, Canada is not distinguished by well-known tunnels.

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Turnip

Turnip (Brassica rapa, Rapifera Group), biennial vegetable belonging to the Cruciferae family and grown in all provinces as a root crop.

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Turtle

Turtles are egg-laying, toothless reptiles with limb girdles roofed over by a wide rib cage and fused to bony plates in the skin.

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Turtle Island

For some Indigenous peoples, Turtle Island refers to the continent of North America. The name comes from various Indigenous oral histories that tell stories of a turtle that holds the world on its back. For some Indigenous peoples, the turtle is therefore considered an icon of life, and the story of Turtle Island consequently speaks to various spiritual and cultural beliefs.

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Uranium

Uranium oxide was first identified in 1789 by M.H. Klaproth in the MINERAL pitchblende, but its distinctive property of radioactivity was discovered much later (1896) by Henri Becquerel.

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Vegetable

A vegetable is a herbaceous plant of which all or a part is eaten, raw or cooked. Vegetables are a valuable source of protein, vitamins, minerals, trace elements and fibre. All vegetables are high in carbohydrates, which contribute to their unique taste.

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Vetch

Vetch species are in the genus Vicia, which includes about 150 species native to both the Old and New Worlds, especially the Mediterranean area. Only 3 are native to Canada, although 9 or so have been introduced.

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Violet

The Violet is a family (Violaceae) of annual or perennial herbaceous plants widely distributed throughout temperate and tropical regions. Tropical species may reach tree size. Roughly 500 species of genera Viola (violets, pansies) and Hybanthus (green violets) alone occur worldwide.

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Vireo

The vireo (Vireonidae) is a family of small, basically olive green, insectivorous and partly frugivorous songbirds with repetitive, persistent song.