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A waterfall is a phenomenon which occurs when water flowing in a river channel encounters a vertical or near-vertical drop in the channel bed.

The walrus is a tusked, fin-footed mammal. In Canada, the Atlantic walrus is found primarily along the northern coasts of Hudson Bay, Davis Strait, Foxe Basin and Baffin Bay.

There are approximately 4000 species of flowering plants in Canada, of which about 3000 may be considered wildflowers. About one-quarter of these have been introduced from other regions of the world.

The vulture is a large, long-winged, bald-headed bird of prey, normally abundant in warmer latitudes.

Walnut (Juglans), genus of trees of the walnut family (Juglandaceae). The roughly 15 known species are widely dispersed through temperate and tropical regions.

A biosphere reserve represents one of the world’s important ecosystems and is divided into three zones: a protected core zone (such as a park or wildlife area), a buffer zone around the core, and a transition zone that fosters sustainable economic and cultural activity. The World Network of Biosphere Reserves includes 686 sites around the world, 18 of which are in Canada. The network is part of the larger Man and the Biosphere Program of the United Nations Educational, Scientific and Cultural Organization (UNESCO). Biosphere reserves are designated by UNESCO to help conserve biodiversity, demonstrate sustainable development and build the local community’s capacity to deal with human and environmental issues.

Whitefish, common name for several freshwater fishes of class Actinopterygii, family Salmonidae (salmon), subfamily Coregoninae (sometimes elevated to family rank).

Willow (Salix) is a genus of trees and shrubs of the willow family (Salicaceae). About 300 species occur worldwide, chiefly in the Northern Hemisphere.

The pronghorn (Antilocapra americana) is a small, very fleet ungulate of the order Artiodactyla.

In the atmosphere, between about 1.2 and 1.6 km above the Earth's surface, winds tend to blow parallel to rather than across the lines of equal pressure (isobars).

Toxic PropertiesToxic reactions generally are caused by chemical compounds that are produced by plants or absorbed from soil. These compounds produce undesirable physiological responses in individuals or animals.

Dock, herbaceous plant of genus Rumex, family Polygonaceae (buckwheat); most docks are perennial.

Flowers, mostly small, commonly white or yellow, are borne as terminal clusters on hairy stalks. Plants form tufted, spreading cushions, frequently giving striking patches of colour. S.

Origins Lava tube caves, an important minor class, are formed by channelled outflow of molten lava in congealing flows. Sea caves most commonly result from erosion by waves.

Successful actions to protect the ENVIRONMENT and conserve natural RESOURCES constitute environmental management.

 Biodiversity is the variety of life (genetic, species and ecosystem levels) on Earth or some part of it. It includes all living forms, plants, animals and micro-organisms. It is the natural wealth of a region that provides resources and ecological services.

El Niño is a pronounced warming of the Pacific Ocean current off the coast of South America.

Phlogopite can be found in metamorphosed LIMESTONES, dolomites, serpentines and IGNEOUS ROCKS. It is light to dark brown and has properties and uses similar to muscovite.

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.

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.