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Chloralkali process

The chloralkali process is a process used to create sodium hydroxide, chlorine, and hydrogen from sodium chloride and water. It is normally conducted in a tank separated by a membrane, although there are other methods, such as using mercury. If p ...

                                               

Clastic rock

Clastic rocks are composed of fragments, or clasts, of pre-existing rock. Although, in principle, almost any rock made of eroded former rock is clastic such as sandstone or mudstone, in practice the term is used for clasts of at least gravel size ...

                                               

Coblentz (lunar crater)

Coblentz is a small crater that can be found on the far side of the Moon, to the south of the much larger crater Bolyai. This crater has a circular edge, but it has been worn away by asteroid impacts. This is most noticeable at the southern end w ...

                                               

Cognitive-behavioral therapy

Cognitive Behavioral Therapy is a type of psychotherapy which aims to help people transform their maladaptive thoughts and behaviours into a better state of being. Psychologists task patients to try out different situational coping skills and hel ...

                                               

Cold

Cold is a relative term used in comparison with the adjective warm. Because it is relative, there is no range in coldness. The temperatures in the winter season are often categorized as being cold. Cold is the opposite of hot. The coldest possibl ...

                                               

Color rendering index

Color rendering index is a number rating given to light bulbs or lamps for how "right" they make colors look. This number is usually written on the side of light bulbs box. The CRI number can be as high as 100, or as low as zero; and sometimes it ...

                                               

Colour

Colour or color is a property of light as seen by people. In Commonwealth English, it is spelled" colour”, while in American English it is" color”. The most common colour names are: Turquoise Navy Tan Gray Off White White Lime Navy Blue Olive Aqu ...

                                               

Common ivy

Common Ivy is a vine. It is evergreen - it does not lose its leaves in winter. Originally, the plant grew on the Macaronesian islands, but it spread through the Mediterranean and Europe to Asia. All parts of the plant are poisonous. It is often u ...

                                               

Composite Compound 4

Composite Compound 4 is a kind of plastic explosive, which is often used in military operations. C4 is malleable: It can be given almost any form. It can also be handled safely, as neither fire, electricity nor shock will cause an explosion. C4 w ...

                                               

Condensation

Condensation is the process through which gas changes into a liquid when it touches a cooler surface. Condensation is an important part of the water cycle. It is the opposite of evaporation.

                                               

Conjunction (astronomy and astrology)

Conjunction is a word used in astronomy and astrology. It means that, as seen from some place, two celestial bodies appear near one another in the sky. The event is also sometimes known as an appulse. The astronomical and astrological symbol of c ...

                                               

Consciousness

Consciousness means being awake, alert and responsive to the environment. The definition of consciousness may differ in psychology, neuroscience, philosophy and other related sciences. It is often disputed amongst academics and scientists. Consci ...

                                               

Constellation

A constellation is a group of stars which make up imaginary outline or pattern in the night sky. Usually they are said to represent an animal, mythological person or creature in a shape. When seen, the group of stars seem to make a pattern. The w ...

                                               

Continental climate

Continental climate is a climate that is characterized by winter temperatures cold enough to support a fixed period of snow cover each year, and is not arid or semi-arid. Summers are hot or warm. In the Koppen climate classification, this climate ...

                                               

Coprophilia

Coprophilia is a sexual fetish people feel when they come into contact with feces. Coprophilia can be said to be liking the smell, taste, or feel of feces in a sexual way. The feeling can be either through touching the skin or through rubbing the ...

                                               

COROT-7b

COROT-7b is an exoplanet that orbits the star COROT-7 in the constellation Monoceros, 489 light years from Earth. It was first detected by the French-led COROT mission and reported in 2009. Until the announcement of Kepler-10b in January 2011, it ...

                                               

Cotyledon

A cotyledon, or seed leaf, is a leaf that is stored in a seed. When the seed sprouts, the cotyledons are the first leaves that the plant has. Monocot plants have only one cotyledon, and other plants have two. Cotyledons often look very different ...

                                               

Crackme

A crackme is a small program designed to test a programmers reverse engineering skills. It is also known by the terms reversemes and keygenmes. They are created to have a legal way to "crack" software.

                                               

Crater

A crater is a round dent on a planet. They are usually shaped like a circle or an oval. They are usually made by something like a meteor hitting the surface of a planet. Underground activity such as volcanoes or explosions can also cause them but ...

                                               

Crater (constellation)

Crater is a constellation. In Latin it means cup. It is a constellation in Greek mythology. It was one of the 48 constellations listed by the 1st century astronomer Ptolemy, and remains one of the 88 modern constellations. It is located in the So ...

                                               

Crux

Crux, commonly known as the Southern Cross, is one of the modern constellations. It points to the directions of north, south, east and west. It is the smallest modern constellation. It was first described by the Italian navigator Andrea Corsali i ...

                                               

Cryogenian

The Cryogenian is a geological period, from ~720 million years ago to 635 mya. It lies in the middle Proterozoic eon before the Ediacaran period. The period is important to both Earth science and biology because it contains the two longest and mo ...

                                               

Cryonics

Cryonics is the process of vitrifying a human about −196 degrees Celsius after a doctor says they are dead. People do that in hope that, in the future when medicine becomes better, they can have life again, solve their health problems and have et ...

                                               

Cryosphere

The cryosphere is the part of the Earth’s surface where water is in solid form, including sea ice, lake ice, river ice, snow cover, glaciers, ice caps and ice sheets, and frozen ground. It often overlaps with the hydrosphere, the water on, under ...

                                               

Cumulus cloud

Cumulus clouds are white clouds that are dense and large. They are known to look like cauliflower. Mostly, you can see easily that cumulus clouds have flat bottoms but the tops are always changing shape. Seeing a cumulus cloud means that the air ...

                                               

Cupid (moon)

Cupid is an inner moon of Uranus. It was found by Mark Showalter and Jack J. Lissauer in 2003 using the Hubble Space Telescope. It was named after a character in William Shakespeares play Timon of Athens. It is the smallest of the closer Uranian ...

                                               

Curie (unit)

The curie is a unit of measurement. It measures radioactivity. It is defined as 1 Ci = 3.7×10 decays per second. This is roughly the activity of 1 gram of the radium isotope 226 Ra. Radium was studied by the pioneers of radiology, Marie and Pierr ...

                                               

Cyllene (moon)

Cyllene or Jupiter XLVIII, is a moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2003, getting the designation S/2003 J 13. Cyllene is about 2 kilometres in diameter, and orbits Jupi ...

                                               

Cytokinesis

Cytokinesis is the division of cells after either mitosis or meiosis I and II. During cytokinesis, the cytoplasm the liquid center of the cell that holds the organelles into place splits into two equal halves, and the cell becomes two daughter ce ...

                                               

Darkness

Darkness is when there no light. In practice, out in the open air, there almost always is some light, however slight. The darkness of the night sky is estimated by a nine-point scale known as the Bortle scale. Darkness is made by blocking light f ...

                                               

Data science

Data science is the study of the extraction of knowledge from data. It uses various techniques from many fields, including signal processing, mathematics, probability, machine learning, computer programming, statistics, data engineering, pattern ...

                                               

Decompression chamber

A decompression chamber is a large container that divers can enter after they have surfaced to help their bodies return to normal atmospheric pressure. It is also called a "recompression chamber" or "hyperbaric oxygen therapy chamber". When a div ...

                                               

Deep Impact (space mission)

Deep Impact was a NASA space mission to study comets. It was sent out to meet Comet Tempel 1, and to crash a smaller space rocket deep into the comets surface. Deep Impact was launched on January 12, 2005 from the Cape Canaveral Air Force Station ...

                                               

Delisle scale

The Delisle scale is a scale to measure temperature. It was introduced by French astronomer Joseph-Nicolas Delisle in 1732. Delisle used a thermometer that worked with Mercury. The unit is abbreviated "De" or "D". 0°De is equal to the boiling poi ...

                                               

Demography

Demography studies the statistics of human populations. Demography is usually used to study dynamic populations. It covers the study of the size, structure and distribution of these populations and the changes in these populations due to births, ...

                                               

Deposition (geology)

Deposition is the geological process where material is added to a land. This can happen in many places, such as a beach or river. Some parts of a shoreline build up and grow out, whereas other parts of the shoreline erode and fall into the sea. I ...

                                               

Desdemona (moon)

Desdemona is a closer moon to Uranus. It was found from the images taken by Voyager 2 on 1986-01-13, and was given the designation S/1986 U 6. Desdemona is named after the wife of Othello in William Shakespeares play Othello. It is also designate ...

                                               

Desertification

Desertification is the expansion of desert into the surrounding areas. The desert area in the world is getting bigger. Desertification usually happens on the edge of deserts. It is caused by a variety of factors.

                                               

Dew

Dew is a thin film of water that has condensed on the surface of objects near the ground in the morning or evening. These objects cool in the night. When they cool, the thin layer of air around them cools too. This makes some water vapor condense ...

                                               

Dew point

The dew point is the temperature where water vapor condenses into liquid water. All air holds different amounts of water vapor. The dew point shows the amount of moisture in the air. The higher the dew point is, the higher the level of moisture i ...

                                               

Dia (moon)

Dia ls the second-outermost prograde non-spherical moon of Jupiter. It was found by a team of astronomers from the University of Hawaii led by Scott S. Sheppard in 2000. Dia is about 4 kilometres in diameter, and orbits Jupiter at an average dist ...

                                               

Diamondback rattlesnake

The diamondback rattlesnake is a very poisonous rattlesnake. Diamondbacks are found from Florida to California. The bite from a big rattlesnake can hold enough poison to kill a person. However, if the victim gets to a doctor quickly enough, he or ...

                                               

Diesel generator

A diesel generator is a diesel-electric system, a diesel engine that powers a electrical generator to produce electricity. Diesel generators are located at places where there is no electricity supply from the electrical grid for emergency supply ...

                                               

Dietary mineral

A dietary mineral is a chemical element that a living thing needs to be part of what they eat, other from the four elements carbon, hydrogen, nitrogen, and oxygen which are already very common in living things. One example of a dietary mineral is ...

                                               

Disproportionation

Disproportionation is a redox reaction in which an electron from one atom is taken by another one, making two different chemicals. It is the opposite of symproportionation, which is the giving of electrons from one atom to another atom, It makes ...

                                               

Double Cluster

The Double Cluster, is NGC 884 and NGC 869, a group of two open star clusters in the Perseus constellation. It has many blue and red stars. Both are visible with the naked eye. NGC 869 and NGC 884 lie at a distance of 7.500 light years. That is r ...

                                               

Drop

A drop is a small bit of liquid, such as water, which is held together by surface tension. It is normally thought of as falling. Something that is dropping can sometimes be called dripping. Drops are often circular in shape, and sometimes when li ...

                                               

Dvorak technique

The Dvorak technique is a widely used system to subjectively estimate tropical cyclone intensity based solely on visible and infrared satellite images. Several agencies issue Dvorak numbers for cyclones of sufficient intensity. These include the ...

                                               

Dynamic pressure

In fluid dynamics dynamic pressure depends on density and velocity of the fluid. It is defined by the following equation with q standing for dynamic pressure or "velocity pressure": q = 1 2 ρ v 2 {\displaystyle q\ =\ {\frac {1}{2}}\rho v^{2}} whe ...

                                               

Earthrise

Earthrise is a photo of the Earth from the Moon taken on the Apollo 8 mission. It was taken by astronaut William Anders on December 24, 1968. It was a very important picture, because it helped people realize how fragile the Earth looks. It starte ...

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