Топ-100

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Avalanche

An avalanche is a natural disaster linked to snow. When there is too much snow on a mountain, some of the snow may fall, causing damage to things in its path. This is called an avalanche. People talk about avalanches because they may be dangerous ...

                                               

Cyclone

In meteorology, a cyclone refers to any low pressure area with winds spiralling inwards. Cyclones rotate clockwise in the Southern Hemisphere and anti-clockwise in the Northern Hemisphere. Cyclone is the general term for a variety of low pressure ...

                                               

Weather

Weather is the day-to-day or hour-to-hour change in the atmosphere. Weather includes wind, lightning, storms, hurricanes, tornadoes, rain, hail, snow, and lots more. Energy from the Sun affects the weather too. Climate tells us what kinds of weat ...

                                               

Winter storm

Winter storms or snowstorms happen when warm, wet air meets with cold air. The warm, wet air mass and the cold air mass can each be 1000 km or more in diameter. Snowstorms affecting Northeastern United States often get their moisture from air mov ...

                                               

Natural resource

A natural resource is what people can use which comes from the natural environment. Examples of natural resources are air, water, wood, oil, wind energy, natural gas, iron, and coal. The dividing line between natural resources and man-made resour ...

                                               

Food web

A food web is similar to a food chain but larger. The diagram combines many food chains into energy relationships among organisms. Food webs show how plants and animals are connected in many ways. The arrow points from the organism being eaten to ...

                                               

Green economy

The green economy is defined as an economy that results in reducing environmental risks and ecological scarcities. It aims for sustainable development without degrading the environment. It is closely related with ecological economics, but has a m ...

                                               

Mineral

Minerals are substances that are formed naturally in the Earth. Rocks are made of minerals. Minerals are usually solid, inorganic, have a crystal structure, and form naturally by geological processes. The study of minerals is called mineralogy. A ...

                                               

Water

Water is a transparent, tasteless, odorless, and almost colorless chemical substance and covers over 70% of Earths surface. No known life can live without it. Lakes, oceans, seas, and rivers are made of water. Precipitation is water that falls fr ...

                                               

Reality

Reality means anything that exists. An event that has actually happened, or a thing which really exists is said to have "reality." Something close to reality is realistic. Reality is the state of things as they are, rather than as they may appear ...

                                               

General semantics

General semantics is a philosophy that deals with how people react to things that happen around them based on meaning. It was created by Alfred Korzybski during the 1920s and early 1930s. The goal of general semantics is for people to know that w ...

                                               

Metaphysics

Metaphysics is a major branch of philosophy. It concerns existence and the nature of things that exist. Altogether it is a theory of reality. Ontology is the part of metaphysics which discusses what exists: the categories of being. Apart from ont ...

                                               

Mysticism

Mysticism is the belief that people can directly experience God or true reality, rather than through books, ritual or other people. People who practice this are called mystics. Mystics exist within most religions, though not all people who practi ...

                                               

Ontology

Ontology is the philosophical study of the nature of being, becoming, existence, or reality. It is part of the major branch of philosophy known as metaphysics. Ontology deals with questions about what things exist or can be said to exist, and how ...

                                               

Platonic realism

Platonic realism is the theory of reality developed by Plato, and explained in his theory of Forms. Platonic realism states that the visible world of particular things is a shifting exhibition, like shadows cast on a wall by the activities of the ...

                                               

Tattva

Tattva is a Sanskrit word that means thatness, principle, reality or truth. According to many Indian schools of philosophy, a tattva is an element or aspect of reality conceived as an aspect of deity.

                                               

Universe

The Universe is all of time and space and its contents. It is made of many millions of millions of stars and planets and enormous clouds of gas separated by a big space. Astronomers can use telescopes to look at very distant galaxies. This is how ...

                                               

Natural sciences

There are some sciences that are used to study nature. According to these sciences, the things that can be observed in nature follow certain rules. These rules are often unknown, and natural sciences are about finding them. They often use what is ...

                                               

Water (molecule)

Water covers 70-75% of the Earths surface in its liquid and solid states, and is present in the atmosphere as a vapor. It is the most abundant molecule on the Earths surface. At room temperature, it is a nearly colorless, flavorless, and odorless ...

                                               

Bathing

Bathing is putting the body into a fluid, most often water, or a solution with water. Usually it is done for hygiene for religious purposes, for fun. Sometimes bathing is also done as a form of therapy. When people talk about bathing, they most o ...

                                               

Brackish water

Brackish water is salt water and fresh water mixed together. It is saltier than fresh water, but not as salty as seawater. It may result from mixing of seawater with fresh water, as in estuaries, or it may occur in brackish fossil aquifers. Some ...

                                               

Water cycle

The water cycle is the cycle that water goes through on Earth. Water is essential for life as we know it. It is present throughout the Solar System, and was part of the Earth from its formation. The source of the water was the same as the source ...

                                               

Desalination

Desalination means any process that removes the excess salt and other minerals from water in order to obtain fresh water suitable for animal consumption or irrigation. Most desalination is by distillation. Some is by reverse osmosis or other meth ...

                                               

Drowning

Drowning means dying from not being able to breathe in air and breathing in water or another liquid. Near drowning is the survival of drowning where the person passes out or breathes in water, and can cause serious problems, including death, afte ...

                                               

Water footprint

A water footprint is the amount of freshwater used by individuals, groups or companies in order to make goods or provide services used by the community. These goods and services may be needed around the entire world. A water footprint can be dete ...

                                               

Water heating

Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning and bathing, and space heating. In industry both hot water and water heated ...

                                               

Heavy water

Heavy water is a form of water based on deuterium. It has a larger than normal amount of the hydrogen isotope deuterium 2 H or D, also known as heavy hydrogen. Ordinary water has the common hydrogen-1 isotope 1 H or H, also called protium. This m ...

                                               

Ice

Ice is the common name for frozen water. Other liquids, such as ammonia or methane or milk could be called ice when they freeze but they are called milk ice, for instance, instead of just ice. Liquid water becomes solid ice when it is very cold. ...

                                               

Ice cube

Ice cubes are small pieces of ice that are often cubes. These pieces are sometimes used to cool drinks. Ice cubes are used in mixed drinks, when the drink has the words "on the rocks." Ice cubes are made by filling a tray with water and putting i ...

                                               

Icicle

Icicles are formed on days when the outdoor air temperature is sub freezing and heat from sunlight melts snow or ice on anything sloped. The droplets of water freeze as they loses their heat to the cold air, forming a cone-like shape of ice.

                                               

Water politics

Water politics are the politics related to whether people have enough fresh drinking water. There is less fresh water available for many reasons. One reason is that some industries use huge amounts of water. Another problem is water pollution, wh ...

                                               

Salt water

Saline water is water with a high amount of salt in it. It often means the water from the seas and oceans. Almost all the water on Earth is saline. Salt water used for making or preserving food, is usually saltier than sea water and is called bri ...

                                               

Water scarcity

Water scarcity is a lack of fresh water to meet what is needed in a given area. For us, fresh water is drinkable, and sea water is not. This is because sea water has a high salt content, which humans cannot deal with. There are arid and deserted ...

                                               

Sea ice

Sea ice is simply frozen ocean water. It forms, grows, and melts in the ocean. In contrast, icebergs, glaciers, ice sheets, and ice shelves all originate on land. Sea ice occurs in both the Arctic and Antarctic.

                                               

Snowmelt

Snowmelt can also affect how good and safe drinking water is. Snowflakes collect air pollution as they fall. Snow on the ground collects pollution from cars, farm animals, fertilizer, and other things. The snowmelt collects dirt and other polluta ...

                                               

Soap bubble

A soap bubble is a very thin film of soap water. Their shape is a hollow, round ball, or sphere. They have a colorful surface. Soap bubbles do not last very long. Sometimes they break in the air. When they touch something else, they usually break ...

                                               

Stream

A stream is a natural flow of water moving across country between banks. It is smaller than a river. The primary meaning of stream is a body of water, confined within a bed and banks, and detectably flowing. Synonyms or related words include rive ...

                                               

Ball lightning

Ball lightning is a glowing ball of lightning that sometimes appears in a thunderstorm, but usually lasts much longer than lightning. Scientists do not understand ball lightning very well, and some even do not think ball lightning is real, becaus ...

                                               

Cold wave

Cold waves are weather incidents that involve cooling of temperatures and air. Cold waves can cause death and injury for animals, people and livestock. Extreme winter cold causes freezing of water pipelines if they are poorly insulated. Motor veh ...

                                               

Dust Bowl

The "Dust Bowl" is a phrase used to describe prairie regions of the United States and Canada in the 1930s. The Dust Bowl spread from Saskatchewan and Manitoba to the north, all the way to Oklahoma and parts of Texas and New Mexico in the south. I ...

                                               

Dust devil

Dust devils are twirling masses of air that form in the desert and send sand spinning. The height of a dust devil can range from a few meters tall to more than 1.000 meters tall. They are usually harmless, but occasionally they can cause some dam ...

                                               

Geophysical Fluid Dynamics Laboratory

The Geophysical Fluid Dynamics Laboratory is a laboratory in the National Oceanic and Atmospheric Administration /Office of Oceanic and Atmospheric Research.

                                               

Greenhouse effect

The greenhouse effect occurs when certain gases in the Earths atmosphere trap infrared radiation. This makes the planet become warmer, similar to the way it makes a greenhouse become warmer. The greenhouse effect is caused by greenhouse gases, th ...

                                               

Heat lightning

Heat lightning is the name for lightning from thunderstorms that are far away that is not followed by thunder. This happens because the lightning is far away and the sound of the thunder stops before it reaches the person watching the thunderstor ...

                                               

Lightning

For the NHL team, see Tampa Bay Lightning For the World War II fighter, see P-38 Lightning Lightning is a very powerful electrical discharge made during a thunderstorm. The electric current makes the air very hot. The suddenly heated air expands ...

                                               

Mesocyclone

A mesocyclone is a vortex of air, about 2 to 10 km in diameter, inside a convective storm. That is, it is air that rises and rotates around a vertical axis, usually in the same direction as low pressure systems in a given hemisphere. They are mos ...

                                               

Numerical weather prediction

Numerical weather prediction is the way weather forecasts are made. This is done using computer models of the atmosphere. Such models describe the current weather conditions, and how they change over time using equations. Using the current weathe ...

                                               

Thunder

For the aircraft, see P-47 Thunderbolt and A-10 Thunderbolt II. Thunder is a very loud sound that is made sometimes during a very big rain storm. Thunder is so loud, it can be heard from a very far distance. It can sound like a boom, a crash, or ...

                                               

Tornado Alley

Tornado Alley is a colloquial term most often used to refer to the area of the United States in which tornadoes happen more than in any other part of the country. The 1974 super tornado outbreak with 148 tornadoes, took place in Georgia, Illinois ...

                                               

Tropical wave

Tropical waves, or easterly waves, also known as African easterly waves in the Atlantic Ocean, are a type of atmospheric trough, an extended area of moderately low air pressure, leaning north to south, which move from east to west across the trop ...

Encyclopedic dictionary

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Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

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