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Are you aware of the fact the rivers are one of the sources of fresh water. The points of origin of most of the rivers are mountains. This article gives a brief introduction on the formation of the rivers.
Read more at Buzzle: http://www.buzzle.com/articles/how-are-rivers-formed.html
A natural stream of freshwater flowing downhill from its source in the mountains to meet an ocean or a lake is known as a river. The river water is confined to a channel or a stream bed.
The rivers are formed when group of springs and streams known as headwaters having their origin in the mountains flow down to form a large stream or springs. The stream bed of a river lies between the banks of a river. The large streams are called a river while the smaller ones are called creeks, brooks, rivulets or tributaries. The rivers form the major component of the water cycle. The water in a river is accumulated from precipitation of ground water and also through the release of stored water in natural reservoirs such as glaciers.
Formation of Rivers
Every river in this universe has a point of origin and the gravity plays a significant role in the direction of the flow of a river. In areas where the climate is humid, the point of origin of the rivers is from springs. The points of origination of rivers are the marshes, lakes, and melting glaciers.
One of the sources of water that replenish the rivers is either the melting snow or the rainwater. This process is known as the precipitation.
Another major source of river water is the rain. When it rains heavily in the hills, the water trickles down the steep slopes and flows onto a riverbed. Initially, the water from the hills flows in an evenly distributed fashion and is called surface run-off. When this water flow travels a certain distance, it begins to flow in parallel rills and also gathers momentum. Soon these parallel rills unite to form a stream. As the rills converge with the stream a brook is formed. This brook flows through a valley. The volume of the water in a brook becomes constant when it gains sufficient volume of groundwater. The brook becomes a river when the water level in the brook increases.
Types of Rivers
The rivers are classified on the basis of the sediments it carries. The sediment carried is controlled by factors such as climate, geology and the stream gradient. Here are a few classifications of the rivers.
Youthful River - A youthful river has a steep gradient and very few tributaries. A youthful river is bound to flow quickly and swiftly. A few examples of youthful river include Trinity River and Brazos in the USA, and Ebro River in Spain.
Mature River - A mature river is less steep and flows slowly compared to the youthful river. There are many tributaries that feed a mature river. The sediment deposit is also less. Examples of mature river include St.Lawrence River, Ohio River and River Thames.
Old River - An old river has a low gradient and is depended on flood plains is known as old river. Some of the world famous old rivers include the Ganges, Nile, and Euphrates.
Rivers have been one of the sources of food, water and transport since pre-historic times. The rivers aid the cultivation of crops by supplying water. Historians claim navigation of rivers date back to the Indus Valley Civilization. Rivers of the world are the major source of fresh water and they sustain their own food chain.

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images

Beautiful Wallpaper Images Biography

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A garden is a planned space, usually outdoors, set aside for the display, cultivation, and enjoyment of plants and other forms of nature. The garden can incorporate both natural and man-made materials. The most common form today is known as a residential garden, but the term garden has traditionally been a more general one. Zoos, which display wild animals in simulated natural habitats, were formerly called zoological gardens. Western gardens are almost universally based on plants, with garden often signifying a shortened form of botanical garden.

Some traditional types of eastern gardens, such as Zen gardens, use plants such as parsley. Xeriscape gardens use local native plants that do not require irrigation or extensive use of other resources while still providing the benefits of a garden environment. Gardens may exhibit structural enhancements, sometimes called follies, including water features such as fountains, ponds (with or without fish), waterfalls or creeks, dry creek beds, statuary, arbors, trellises and more.

Some gardens are for ornamental purposes only, while some gardens also produce food crops, sometimes in separate areas, or sometimes intermixed with the ornamental plants. Food-producing gardens are distinguished from farms by their smaller scale, more labor-intensive methods, and their purpose (enjoyment of a hobby rather than produce for sale). Flower gardens combine plants of different heights, colors, textures, and fragrances to create interest and delight the senses.

Gardening is the activity of growing and maintaining the garden. This work is done by an amateur or professional gardener. A gardener might also work in a non-garden setting, such as a park, a roadside embankment, or other public space. Landscape architecture is a related professional activity with landscape architects tending to specialise in design for public and corporate clients.Garden design is the creation of plans for the layout and planting of gardens and landscapes. Gardens may be designed by garden owners themselves, or by professionals. Most professional garden designers are trained in principles of design and in horticulture, and have an expert knowledge and experience of using plants. Some professional garden designers are also landscape architects, a more formal level of training that usually requires an advanced degree and often a state license.

Elements of garden design include the layout of hard landscape, such as paths, rockeries, walls, water features, sitting areas and decking, as well as the plants themselves, with consideration for their horticultural requirements, their season-to-season appearance, lifespan, growth habit, size, speed of growth, and combinations with other plants and landscape features. Consideration is also given to the maintenance needs of the garden, including the time or funds available for regular maintenance, which can affect the choices of plants regarding speed of growth, spreading or self-seeding of the plants, whether annual or perennial, and bloom-time, and many other characteristics. Garden design can be roughly divided into two groups, formal and naturalistic gardens.

The most important consideration in any garden design is, how the garden will be used, followed closely by the desired stylistic genres, and the way the garden space will connect to the home or other structures in the surrounding areas. All of these considerations are subject to the limitations of the budget. Budget limitations can be addressed by a simpler garden style with fewer plants and less costly hardscape materials, seeds rather than sod for lawns, and plants that grow quickly; alternatively, garden owners may choose to create their garden over time, area by area.Gardeners may cause environmental damage by the way they garden, or they may enhance their local environment. Damage by gardeners can include direct destruction of natural habitats when houses and gardens are created; indirect habitat destruction and damage to provide garden materials such as peat, rock for rock gardens, and by the use of tapwater to irrigate gardens; the death of living beings in the garden itself, such as the killing not only of slugs and snails but also their predators such as hedgehogs and song thrushes by metaldehyde slug killer; the death of living beings outside the garden, such as local species extinction by indiscriminate plant collectors; and climate change caused by greenhouse gases produced by gardening.

Watering gardens.

Some gardeners manage their gardens without using any water from outside the garden, and therefore do not deprive wetland habitats of the water they need to survive. Examples in Britain include Ventnor Botanic Garden on the Isle of Wight, and parts of Beth Chatto's garden in Essex, Sticky Sticky Wicket in Dorset, and the Royal Horticultural Society's gardens at Harlow Carr and Hyde Hall. Rain gardens absorb rainfall falling onto nearby hard surfaces, rather than sending it into stormwater drains. For irrigation, see rainwater, sprinkler system, drip irrigation, tap water, greywater, hand pump and watering can.