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Ice and the Density of Water
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Ice and the Density of Water

Why does ice float on top of water rather than sink, like most solids? There are two parts to the answer to this question. First, let's take a look at why anything floats. Then, let's examine why ice floats on top of liquid water, instead of sinking to the bottom. Why Ice Floats A substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture.

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China: Population

With a population estimated at 1.4 billion people as of 2017, China clearly ranks as the world's most populous country. With the world's population approximately 7.6 billion, China represents 20% of the people on Earth. Policies the government has implemented over the years may well result in China losing that top ranking in the near future.
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Abortion on Demand: A Second Wave Feminist Demand

Abortion on demand is the concept that a pregnant woman should be able to access an abortion at her request. Reproductive rights, which encompasses abortion access, birth control access, and more, became a crucial battleground for the feminist movement beginning in the 1970s and continuing to the present day.
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The Symptoms of the Black Death

The Black Death is a plague which killed millions of people. In one particularly destructive explosion, over a third of the whole European population might have died in a few years in the mid 14th century, a process which changed history, birthing, among other things, the start of the modern age and the Renaissance.
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How Is Gold Formed? Origins and Process

Gold is a chemical element easily recognized by its yellow metallic color. It is valuable because of its rarity, resistance to corrosion, electrical conductivity, malleability, ductility, and beauty. If you ask people where gold comes from, most will say you obtain it from a mine, pan for flakes in a stream, or extract it from seawater.
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Why Does Alcohol Burn on a Cut or Wound?

If you've ever applied alcohol to a cut or other wound, you know it stings and burns. It doesn't matter which type of alcohol you use-ethanol, isopropyl, and rubbing alcohol all produce the effect. The alcohol doesn't physically burn you, but you feel the sensation because the chemical activates the same nerve receptors in your skin that let you know boiling water or a flame is hot.
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13 Creative Examples of Informal Assessments for the Classroom

There are a variety of ways to assess a student's progress and understanding. Two of the primary methods are formal and informal assessments. Formal assessments include tests, quizzes, and projects. Students can study and prepare for these assessments in advance, and they provide a systematic tool for teachers to measure a student's knowledge and evaluate learning progress.
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What to Pack for College

Deciding what to pack when you head to school may seem more overwhelming than trying to get your entire high school career on one tiny admissions application. With a little planning and foresight, however, it doesn't have to be as complicated as it might seem at first. You'll Buy Stuff When You Get There You don't have to plan for your entire academic year when packing, especially if you're on a really tight budget.
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What Are Derivational Morphemes?

When you're talking about biology, morphology is defined as the branch of study that deals with the form and structure of organisms and their unique structural features. Linguists often think of language as a living thing because, like a biological life form, it is reshaped by external forces acting on its structure and also changes over time.
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The Difference Between 'Iranian' and 'Persian'

The terms Iranian and Persian are often used interchangeably to describe people from Iran, and some people think they mean the same thing, but is one term correct? The terms “Persian” and “Iranian” don't necessarily mean the same thing. Some people draw a distinction in that Persian relates to a particular ethnicity, and being Iranian is a claim to a certain nationality.
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Glowing Bubbles

Bubbles are already awesome, but glowing bubbles are even better. It is easy and safe to make bubbles glow, plus it doesn't require any hard-to-find materials. Here is what you do. Materials Bubble solution Glow in the dark solution (can use washable glow paint or can make glow solution) Bubble wand Make Glowing Bubbles Mix bubble solution with ​​the glow solution.
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Biography of Lorraine Hansberry, Creator of 'Raisin in the Sun'

Lorraine Hansberry (May 19, 1930-January 12, 1965) was a playwright, essayist, and civil rights activist. She is best known for writing "A Raisin in the Sun," the first play by a black woman produced on Broadway. Her civil rights work and writing career were cut short by her death from pancreatic cancer at age 34.
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Hedy Lamarr

Hedy Lamarr was a film actress of Jewish heritage during MGM's “Golden Age.” Deemed “the most beautiful woman in the world” by MGM publicists, Lamarr shared the silver screen with stars like Clark Gable and Spencer Tracy. Yet Lamarr was much more than a pretty face, she also is credited with inventing frequency-hopping technology.
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A Profile of Supreme Court Chief Justice John Roberts

John Roberts is the current Chief Justice of the Supreme Court and a George W. Bush appointee. He controversially cast the deciding vote upholding Obamacare. Conservative Credentials: Just after passing the bar exam, a young John Glover Roberts went to work clerking for Chief Justice William H. Rehnquest, a position any aspiring Chief Justice likely would covet.
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Biography of Victoriano Huerta, President of Mexico

Victoriano Huerta (December 22, 1850-January 13, 1916) was a Mexican general who served as president and dictator of Mexico from February 1913 to July 1914. An important figure in the Mexican Revolution, he fought against Emiliano Zapata, Pancho Villa, Félix Díaz and other rebels before and during his time in office.
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Factors that Limit School Effectiveness

Districts, schools, administrators, and teachers are continuously in the spotlight and rightfully so. Educating our youth is an essential part of our national infrastructure. Education has such a profound impact on society as a whole that those responsible for educating should receive extra attention.
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Basic Facts to Know About the New York Colony

New York was originally part of New Netherland. This Dutch colony had been founded after the area had first been explored by Henry Hudson in 1609. He had sailed up the Hudson River. By the following year, the Dutch began trading with the Native Americans. They created Fort Orange located at present-day Albany, New York, to take increase profit and take the greater part of this lucrative fur trade with the Iroquois Indians.
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How Many Animal Species Are There?

Everyone wants hard figures, but the fact is that estimating the number of animal species that inhabit our planet is an exercise in educated guesswork. The challenges are numerous. Species counts are biased by our tendency to study certain organisms more than others. Birds, as a group, have been extensively studied, so scientists believe that the estimated number of bird species alive today (between 9,000 to 10,000) is a relatively good approximation of the actual number.
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Is It Safe to Drink Deionized Water?

Drinking a small amount of deionized (DI) water usually doesn't present health issues, but there are several reasons why drinking large volumes of DI or making deionized water your only source is dangerous. Deionized water is water from which ions have been removed. Ordinary water contains many ions, such as Cu 2+ (Copper ion minus two electrons), Ca 2+ (Calcium ion minus two electrons), and Mg 2+ (Magnesium ion minus two electrons.
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Are Smart Cars Safe and Economical or Just Small?

Originally the brainchild of Lebanese-born entrepreneur/inventor Nicolas Hayek (1928-2010) of Swatch watch fame, Smart cars are designed to be small, fuel-efficient, environmentally responsible, and easy to park-the ultimate in-city vehicle. Back in 1994, Hayek and Swatch signed on with Daimler-Benz (the German maker of the venerable Mercedes line of cars, now Daimler AG) to develop the unique vehicle.
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