Life

Although there is no universal agreement on the definition of life, scientists generally accept that the biological manifestation of life is characterized by organization, metabolism, growth, adaptation, response to stimuli and reproduction। may also be said to be simply the characteristic state of organisms.

Properties common to terrestrial organisms (plants, animals, fungi, protists, archaea and bacteria) are that they are cellular, carbon-and-water-based with complex organization, having a metabolism, a capacity to grow, respond to stimuli, and reproduce. An entity with these properties is generally considered life. However, not every definition of life considers all of these properties to be essential. Human-made analogs of life may also be considered to be life.

The biosphere is the part of Earth's outer shell – including air, land, surface rocks and water – within which life occurs, and which biotic processes in turn alter or transform. From the broadest geophysiological point of view, the biosphere is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere (rocks), hydrosphere (water), and atmosphere (air). Currently the entire Earth contains over 75 billion tons (150 trillion pounds or about 6.8 x 1013 kilograms) of biomass (life), which lives within various environments within the biosphere.
Over nine-tenths of the total biomass on Earth is plant life, on which animal life depends very heavily for its existence. More than 2 million species of plant and animal life have been identified to date, and estimates of the actual number of existing species range from several million to well over 50 million. The number of individual species of life is constantly in some degree of flux, with new species appearing and others ceasing to exist on a continual basis. The total number of species is presently in rapid
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Rivers

A river is a natural watercourse, usually freshwater, flowing toward an ocean, a lake, a sea or another river। In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including stream, creek, brook, rivulet, and rill; there is no general rule that defines what can be called a river. Many names for small rivers are specific to geographic location; one example is Burn in Scotland and North-east England. Sometimes a river is said to be larger than a creek,[34] but this is not always the case, due to vagueness in the language.[35] A river is part of the hydrological cycle. Water within a river is generally collected from precipitation through surface runoff, groundwater recharge, springs, and the release of stored water in natural ice and snowpacks (i.e., from glaciers).

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Lakes

A lake (from Latin lacus) is a terrain feature (or physical feature), a body of liquid on the surface of a world that is localized to the bottom of basin (another type of landform or terrain feature; that is, it is not global) and moves slowly if it moves at all। On Earth, a body of water is considered a lake when it is inland, not part of the ocean, is larger and deeper than a pond, and is fed by a river।[32][33] The only world other than Earth known to harbor lakes is Titan, Saturn's largest moon, which has lakes of ethane, most likely mixed with methane। It is not known if Titan's lakes are fed by rivers, though Titan's surface is carved by numerous river beds. Natural lakes on Earth are generally found in mountainous areas, rift zones, and areas with ongoing or recent glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers. In some parts of the world, there are many lakes because of chaotic drainage patterns left over from the last Ice Age. All lakes are temporary over geologic time scales, as they will slowly fill in with sediments or spill out of the basin containing them

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Ocean

An ocean is a major body of saline water, and a principal component of the hydrosphere। Approximately 71% of the Earth's surface (an area of some 361 million square kilometers) is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas। More than half of this area is over 3,000 meters (9,800 ft) deep. Average oceanic salinity is around 35 parts per thousand (ppt) (3.5%), and nearly all seawater has a salinity in the range of 30 to 38 ppt. Though generally recognized as several 'separate' oceans, these waters comprise one global, interconnected body of salt water often referred to as the World Ocean or global ocean. of a global ocean as a continuous body of water with relatively free interchange among its parts is of fundamental importance to oceanography.

The major oceanic divisions are defined in part by the continents, various archipelagos, and other criteria: these divisions are (in descending order of size) the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Southern Ocean (which is sometimes subsumed as the southern portions of the Pacific, Atlantic, and Indian Oceans), and the Arctic Ocean (which is sometimes considered a sea of the Atlantic). The Pacific and Atlantic may be further subdivided by the equator into northerly and southerly portions. Smaller regions of the oceans are called seas, gulfs, bays and other names. There are also salt lakes, which are smaller bodies of landlocked saltwater that are not interconnected with the World Ocean. Two notable examples of salt lakes are the Aral Sea and the Great Salt Lake.

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"Natural" redirects here। For other uses, see Natural (disambiguation).
Bachalpsee in the Swiss Alps; generally mountainous areas are less affected by human activity
Lightning strikes during the eruption of the huge Galunggung volcano in 1982
Much attention has been given to preserving the natural characteristics of Hopetoun Falls, Australia, while allowing ample access for visitors.

Nature, in the broadest sense, is equivalent to the natural world, physical world, or material world. "Nature" refers to the phenomena of the physical world, and also to life in general. It ranges in scale from the subatomic to the cosmic.

The word nature is derived from the Latin word natura, or "essential qualities, innate disposition", and literally means "birth".was a Latin translation of the Greek word physis (φύσις), which originally related to the intrinsic characteristics that plants, animals, and other features of the world develop of their own accord. concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socratic philosophers, and has steadily gained currency ever since. This usage was confirmed during the advent of modern scientific method in the last several centuries.

Within the various uses of the word today, "nature" may refer to the general realm of various types of living plants and animals, and in some cases to the processes associated with inanimate objects–the way that particular types of things exist and change of their own accord, such as the weather and geology of the Earth, and the matter and energy of which all these things are composed. It is often taken to mean the "natural environment" or wilderness–wild animals, rocks, forest, beaches, and in general those things that have not been substantially altered by human intervention, or which persist despite human intervention. For, example, manufactured objects and human interaction generally are not considered part of nature, unless qualified as, for example, "human nature" or "the whole of nature". This more traditional concept of natural things which can still be found today implies a distinction between the natural and the artificial, with the artificial being understood as that which has been brought into being by a human consciousness or a human mind. Depending on the particular context, the term "natural" might also be distinguished from the unnatural, the supernatural, and the artifactual।

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nature

In the evening I sit in front of my house and feel the soft gentle breeze caress my face and cool my body. The breeze is simply beautiful and nature gives it free to me. Actually nature gives this free to everyone, but it seems that not everyone is aware of this.
Sometimes the sky is immensely blue. White silvery clouds glide almost imperceptibly against it. The clouds are never the same as they change their shapes continuously. These things are more beauty that I perceive around me.
Some days when the sky turns back with thick heavy clouds a distance curtain of falling rain can be seen. It appears as though some unseen hand is pouring water onto the land to nourish it. The sight is beautiful and it makes me feel closer to the beauty of the earth.
After a thunderstorm, the air is crisp and cool. Birds come out and sing out their joy to life. I sing too as I frolic barefoot on the cool wet grass beside my house. The frogs croak joyfully. Even the insects seem to buzz and shriek louder. I am sure they are all singing about how beautiful life is. Indeed it is.
In the night the stars make their appearance. Millions of these twinkling jewels can be seen in the black sky. How wondrous it is to gaze at the glory of the universe. No doubt I am just a tiny part of it, but to be able to take it in through my senses makes it even more wondrous.
At night the moon often makes its appearance. Sometimes it is round. Other times it is crescent-shaped. Nevertheless its presence adds to the beauty of the backdrop of stars in the far reaches of space. It is amazing that there are such things.
The little garden beside my house is filled with the things of nature. Little bees, butterflies and other insects fly among the flowers in search of food. The flowers themselves are brightly colored with every possible combination of colors and hues. I feast my eyes on the scene of immense activity and again witness the beauty of nature’s innumerable wonders.
The beauty of nature is so simple and undemanding that we often fail to perceive it. Modern man is deluged with artificial things that cut out his awareness of nature. However I make it a point to smell the roses, to touch the morning dew, to listen to the songs of birds and to be aware of the great wonders that nature presents to me. I feel this great beauty within that is in tune with the great beauty without. Life in the forms nature gives to us is beautiful. We just have to be conscious enough to be aware of it.
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