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1.1. THE ATMOSPHERE MAKES LIFE ON EARTH POSSIBLEEarth is unique among the planets in the solar system. One of the most unique features of Earth is the presence of a stable atmosphere. The various gases that surround a planet make up its atmosphere. Earth's shapes our atmosphere weather, climate, and vegetation patterns and makes life as we know it possible. Without air there would be no day-to-day the weather changes. It would be extremely hot during the day and very cold at night. And, there would be no oxygen and no carbon dioxide to support human and plant life.Components of the atmosphere. A great "ocean" of gases surrounding the earth for miles of forms we the earth's atmosphere, usually known simply as the air. More than 98 per cent of the gases that make up the atmosphere, however, are found within 26 km of the earth's surface. Farther above the earth, the gases, and the air is gradually thin out. Air in its natural state is a colorless, odorless, tasteless mixture of gases. Nitrogen makes up 78 per cent of dry air, oxygen makes up 21 per cent, and other gases such as carbon dioxide, helium, and ozone make up the remaining 1 per cent.Along with gases, air nearly always contains small amounts of water vapor, dust, soot, pollen, seeds, and other particles. Winds, forest fires, and volcanic eruptions sweep many of these particles into the air naturally. Other particles release from chimneys, smokestacks, automobiles, and other polluters. Together, these particles create polluted air, such as the haze and smog that hangs over many cities today.The weather is the condition of the atmosphere for a short period of time at a specific location. The average of the daily weather conditions over a long period of time is known as climate. Location and place certain factors influence the distribution of climates over the earth's surface. These factors, known as climatic controls, are latitude, altitude, and proximity to land and water.Climate's role in the environment. Climate has relationships to all other parts of the earth, its land, its water, and its atmosphere. These relationships work in two ways. Land, water, and the changes that take place in the air play their parts in shaping climate. At the same time, the climate plays its part in helping to shape landforms and soils. Climate helps to keep the water cycle working. Climate, as average weather, also helps to determine what changes take place in the air from month to month and from year to year.The relationships among land, water, air, and climate go even further. They have a direct influence on the kinds of plants and animals that live in a region. Climate also places limits on people’s choices about how they will use the land, the water, and the forms of life found in a region.Climate probably began to play its central role as a part of the natural environment as soon as the earth took form and settled in its orbit around the sun. Today scientists know some things about climate changes in the past. Lands around the equator have probably always been hot. But, there were periods when climates in the middle and high latitudes were warmer than they are today. There were other periods when climates outside the tropics were much cooler than they are today. These cooler periods usually resulted in the buildup of ice on the earth. Glaciers spread over large parts of the earth’s land surface. Packs of ice covered large parts of the world’s oceans and lakes. But always, the glacial periods were followed by warmer periods. This cycle of warming, cooling, and warming again has repeated itself several times in the past. The earth’s last glacial period gave way to a warming period about11,0 years ago.After the last great continental glaciers withdrew (moved back) to the lands around the poles, the climates we know today emerged. Now we have hot climates around the equator, cold climates around the poles, and — as a general rule — climates with warm and cold seasons in the middle latitudes. Where temperatures are hot to warm and where precipitation is heavy to moderate, forests cover the land. Where temperatures are warm enough but where precipitation is lighter or falls only in one season, tall grasses cover the land. In very hot but dry places, special forms of plants grow by storing water in their stems or by taking moisture from the air. In very cold places, tiny mosses and some very short grasses manage to survive.Special forms of animal life, too, live in certain climate regions. Animals that swing from branches and climb up and down tree trunks live in forests. Animals that can hide among grasses or can outrun their enemies survive in grasslands. In very dry regions, there are animals that can go without water for long periods of time or that burrow underground to escape the heat. Animals with furs or thick skins live in very cold regions. Finally, every climate region has its own communities of insects and birds.
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