Browse "Nature & Geography"

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Tidal Energy

Tidal energy is a largely untapped, renewable energy source based largely on lunar gravitation. While the potential of tidal hydroelectricity has long been recognized, compared to river dams, tidal power projects are expensive because massive structures must be built in difficult saltwater environments.

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Tide

The Earth is actually not in orbit around the sun but around the centre of mass of the Earth-sun system. Since all parts of the Earth move in the same orbit, they experience the same acceleration, but only at the Earth's centre is this acceleration exactly balanced by the sun's gravitation.

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Timber Slide

A timber slide is a water-filled chute or runway built to carry “cribs” of timber (see Rafts) around rapids and falls. Similar devices for individual pieces of wood were called “flumes.”

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Titanium

Titanium (Ti) is a metallic element estimated to form about 0.5% of the rocks of the Canadian SHIELD. Titanium minerals of commercial importance include the dioxides rutile and anatase, which are polymorphs of TiO2 and ilmenite (FeO.TiO2), a mineral that contains 52.7% TiO2.

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Toad

Toad is a common name for certain members of the amphibian order Anura, the frogs.

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Tobacco

Tobacco (Nicotiana tabacum) is an annual (potentially perennial) herbaceous plant of the nightshade family.

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Tobacco-Products Industry

Although Canada's tobacco industry has developed largely during this century, tobacco growing goes back to early colonial days, when settlers around the St Lawrence River adopted the smoking customs of aboriginal peoples. French settlers began by copying the agricultural model set by the Indians.

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Tomato

Tomato (Lycopersicon esculentum) is a herbaceous perennial which, in Canada, is grown as an annual because of early frost.

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Tornado

Tornadoes are a type of severe storm. They are typified by a funnel-shaped cloud descending toward the earth.

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Toronto Feature: Hurricane Hazel

Hurricane Hazel was one of the most devastating and unpredictable tropical storms of the 20th century. It was first identified on 5 October 1954, in the Caribbean, where it smashed into Haiti and then battered the Carolinas. The storm struck Toronto on 15 October with winds of 124 km/h and record rainfall.

Macleans

Toronto's Record Snowstorm

This article was originally published in Maclean’s magazine on January 25, 1999. Partner content is not updated.

As a storm raged outside, the constantly ringing phones went unanswered at Environment Canada’s Toronto offices last Thursday. Like many other workplaces in the city, it was shut down - by the worst series of blizzards ever to strike Toronto.

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Touch-me-not

Touch-me-not, or Jewelweed, are common names for family of herbaceous plants (Balsaminaceae) of which Impatiens is the principal genus. The genus name derives from the fact that a ripe seed capsule, when touched, explodes violently, projecting seed some distance.

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Trans Mountain Pipeline Expansion Project

The Trans Mountain Expansion is a project to build about 980 km of new pipe, most of which will run parallel to the existing Trans Mountain oil pipeline. The new line will carry diluted bitumen, or “dilbit,” from Edmonton, Alberta to Burnaby, British Columbia. The expansion will increase the pipeline route’s overall capacity from 300,000 barrels per day to 890,000 barrels per day.

The project’s first owner, Kinder Morgan Canada, sold it to the Government of Canada in 2018. The Trans Mountain Expansion has been a focus of environmental and economic debates, as well as political conflicts. The $12.6 billion project is now under construction.

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Transportation in the North

Inuit and subarctic Indigenous peoples have traversed the North since time immemorial. Indigenous knowledge and modes of transportation helped early European explorers and traders travel and survive on these expanses. Later settlement depended to an extraordinary degree on the development of transportation systems. Today, the transportation connections of northern communities vary from place to place. While the most remote settlements are often only accessible by air, some have road, rail and marine connections. These are often tied to industrial projects such as mines.

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Treeline

The treeline is controlled by CLIMATE in interaction with SOIL. In the North, it is correlated generally with the modal (most common) position of the southern edge of the arctic front in summer, and with such temperature indices as the July 10°C isotherm.

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Trees

Trees are single-stemmed, perennial, woody plants taller than 3 m and exceeding 8 cm in diameter at breast height; shrubs are multistemmed and smaller. These definitions are somewhat arbitrary, since many species (eg, willow, alder, cherry, maple) can grow as trees or shrubs, depending on the environment. Counting the 30-odd shrubs that assume tree form under favourable conditions, there are about 140 native Canadian trees.

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Trillium

Trillium, common and generic name of a perennial plant of the Trilliaceae family (sometimes classified as a subfamily of the LILY family). The name derives from the arrangement of leaves, petals and sepals in groups of 3. The

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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).