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The size of a snowflake is related to how far the snowflake has fallen from the sky and to how well colliding snow crystals stick to each other. The largest snowflakes are usually observed near 0° C because of the increased forces of adhesion at these temperatures.
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Soapstone's use dates back to antiquity: early Egyptians carved it into scarabs and seals; in China and India it was used for ornaments, implements and domestic utensils. It was similarly used at various times over the past 7,500 years by First Nations, Inuit and Norse in Canada (see Inuit Art).
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Soil is the thin, fragile surface layer of Earth. It is a dynamic, loose and porous body of variable thickness (between a few centimetres and a few metres). Soil is formed by continuous transformations of rock or deposit through physical, chemical and biological processes. It is one of the two main components of Earth — the other being oceans — in which life is particularly active. Soil is the source and site of many human activities, and human life greatly depends on it. In Canada, agricultural, environmental and natural-resource scientists are at the forefront of research on soil.
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Classification involves arranging individual units with similar characteristics into groups. Soils do not occur as discrete entities; thus the unit of measurement for soil is not obvious.
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Soil conservation is a combination of all methods of management and land use that safeguard the soil against depletion or deterioration by natural or human-induced factors.
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Soil science is the science that deals with soils as a natural resource. Studies focus on soil formation, classification and mapping, and the physical, chemical and biological properties and fertility of soils as such and in relation to their management for crop production.
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An eclipse occurs when two celestial bodies are aligned so that one blocks the sun’s light from reaching the other. While eclipses can take place on different planets like Jupiter and Neptune, on Earth most eclipses are either solar or lunar eclipses. During a solar eclipse, the moon is positioned between the Earth and the sun, casting a shadow on a portion of the Earth. During a lunar eclipse, the opposite occurs, and the Earth blocks the sun’s light from reaching the moon. Lunar eclipses can be observed with the naked eye. However, looking directly at the sun during a solar eclipse can cause permanent eye damage. Proper eye protection is required to safely observe a solar eclipse.
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The energy contained in sunlight is the source of life on Earth. Humans can harness it to generate power for our activities without producing harmful pollutants. There are many methods of converting solar energy into more readily usable forms of energy such as heat or electricity. The technologies we use to convert solar energy have a relatively small impact on the environment. However, they each have disadvantages that have kept them from being widely adopted. In Canada, the use of solar energy to generate electricity and heat is growing quickly and is helping reduce pollution related to energy production. Despite Canada’s cold climate and high latitudes (which get less direct sunlight than mid-latitudes), solar power technologies are used in many places, from household rooftops to large power plants. The Canada Energy Regulator (formerly the National Energy Board) expects solar power to make up 3 per cent of Canada’s total electricity generation capacity by 2040.
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Solomon's seal (genus Polygonatum) is a herbaceous plant of lily family (Liliaceae). About 50 species occur in the Northern Hemisphere.
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Soybean (Glycine max) is a herbaceous annual belonging to the legume family, grown as an oilseed crop in Canada.
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Sparrow is the name given to several unrelated groups of birds. Sparrows are classified in 3 families: Emberizidae, Estrildidae, and Passeridae.
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Macleans
During the mid-1970s, a Canadian Wildlife Service researcher discovered that birds in Lake Ontario were behaving in a bizarre way: unable to find mates, pairs of female herring gulls were nesting together and devotedly tending clutches of eggs that usually turned out to be infertile.This article was originally published in Maclean's Magazine on April 1, 1996
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A spider is a carnivorous arthropod (segmented, jointed-limbed animal) of the class Arachnida, order Araneae.
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Spinach (Spinacia oleracea), is a leafy, cool-season vegetable that belongs to the Chenopodiaceae family.
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