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How long does a sunset last?

The technical term for the time immediately preceding sunset is twilight, and this is the time most associated with bright, colorful skies. Twilight itself is broken down into three categories that, according to California Institute of Technology, have been arbitrarily determined. These are civil, nautical and astronomical twilight, with civil twilight providing the most light and astronomical providing the least. Stars are not yet visible during civil twilight.\nBoth season and location impact sunset duration, meaning that even the same place on the planet will have different lengths of sunse..

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Where does algae grow?

Algae are photosynthetic organisms that manufacture their own food by harvesting the power of sunlight. Algae must combine the sunlight with photosynthetic cells, carbon dioxide, minerals and water to create sugars. Algae usually have abundant water and carbon dioxide in their environment, and the limiting factor is often sunlight or minerals. This explains why algae populations may sometimes explode when the sunlight levels or mineral content of a body of water change.\nAlgae are common in many aquatic habitats. Algae grow in ponds, lakes, rivers, streams, creeks, puddles, water reservoirs an..

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What is the disengagement theory?

The disengagement theory was advanced in "Growing Old," a book published in 1961 by Elaine Cumming and William Henry. It holds that society benefits from the disengagement of the elderly by avoiding disruption when important members pass away suddenly and by permitting younger individuals to take over the jobs vacated by the elderly.\nOther theories have been advanced, however, that contradict the disengagement theory. These include the activity theory and the continuity theory, both of which assert that society values seniors who remain a viable part of society until they pass. As of April 20..

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How do atomic bombs work?

The energy of an atomic bomb is released in the form of heat, and the sudden expansion of that wave of heat ignites the air around it, which results in a colossal fireball and the release of toxic levels of electromagnetic radiation. The original construction of the first atomic bomb began when several European scientists alerted the United States government that Nazi Germany was in the process of refining radioactive materials for use in a nuclear detonation. This began one of the most potentially destructive arms races in human history, which culminated in the destruction of two major Japane..

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What does the electrical force between two charged objects depend on?

The electric force is vastly important and is an essential component in the behavior and existence of matter, according to the HyperPhysics site by Georgia State University. Electrons are held in their orbits around atoms by the electric force between them and the protons in the nucleus. In every case where electric charges, and thus electric forces, arise, there are unequal numbers of electrons and protons in an object or in one region of an object. This inequality is the charge, and it is attractive to the opposite charge and repulsive to the same charge.\nThe only known phase of matter not ..

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What does movement in the stomach indicate?

The digestive tract runs from the mouth to the anus, and gas is created when bacteria breaks down food as well as when someone breathes, according to the National Institute of Diabetes and Digestive and Kidney Diseases. As gas passes through the digestive tract, it can create the sensation of movement.\nStress produces hormones such as cortisol, which affect the pace of your digestive system, according to the Centers for Disease Control and Prevention. This often results in the sensation of "butterflies," with fluttering movement throughout the stomach. Fluttering and shuffling sensations are ..

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What plants live in the ocean?

Plants are at the bottom of any food chain and the ocean food chain is not an exception. The various types of plants make life in the ocean possible.Phytoplanktons - these are plants that are made up of one cell and help in balancing the carbon cycle. They also act as a source of nutrients for marine animals that feed on them.Dinoflagellates - just like other plants, dinoflagellates are able to make their own food through photosynthesis. While they may sometimes have a toxic effect on marine life, they help stabilize the carbon cycle and act as food for some animals.Diatoms - these are unique ..

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What is the gravity on Mars?

Gravity is calculated based on both a planet's mass and radius. A more massive planet will have a greater gravitational pull. However, a planet with a greater radius will have a smaller gravitational pull. This is due to the fact that gravity becomes weaker the further you are from a planet's core. Due to differences in gravity, a man weighing 200 pounds on Earth would only weigh 75.4 pounds on Mars.

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How big is 5 millimeters?

The word “millimeter” is derived from a similar French word “millimètre.” “Milli” means “thousand” and refers to a unit that is 1/1000 of a “meter,” the metric system's base unit for length. A meter is equivalent to 3.28 feet.\nTen millimeters make up 1 centimeter, or 1/100 of a meter, so 5 millimeters equal 1/2 a centimeter. The British spelling of “millimeter” is “millimetre.”

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How do mitosis and meiosis compare and contrast?

At the beginning of mitosis, chromosomes become visible in the nucleus of the cell. The nuclear membrane dissolves and special fibers, the spindle, line the chromosomes up across the middle of the cell. Pairs of chromosomes move to opposite ends of the cell and new nuclear envelopes form around them. The chromosomes decondense, becoming invisible again as the entire cell splits down the middle. The result of this process is two identical daughter cells.\nThe beginning of meiosis is similar to mitosis, except that homologous, or like, chromosomes pair up. The chromosome pairs consist of one chr..

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