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A black hole is an area in space with such a strong gravitational field that not even light can escape from it. This is the reason that a black hole appears black. Interestingly, a black hole is not actually a hole at all and it is not empty. It contains a large mass of material in a tiny space thus its incredible gravitational field. They are simply called black hole because that’s what they look like in space.
Radon is a colorless gas with the chemical symbol of Rn and an atomic number of 86. It is radioactive and it is a health hazard due to its radioactivity. Radon is a naturally occurring decay product of uranium and is the most stable isotope with a half life of 3.8 days. Radon is the most common cause of public exposure to radiation as it can accumulate from natural sources in building particularly in attics and basements. So if radon is so radioactivity, who discovered its existence?
Lead is a heavy metal that is found in small concentration in the earth’s crust. When first mined, lead is a metallic bluish-white color, but becomes a dull grey when exposed to air. Lead is used for many things such as lead-acid batteries, weights, bullets, as part of certain metal alloys and in radiation shields. It is also used in building construction. Lead was formally used in paint, lead pencils, in cosmetics, plumbing, leaded fuels and pesticides, all which has been prohibited in many countries due to the serious health risks of lead poisoning.
Vaccines, sometimes called immunizations, needles or shots, are medical substances that create immunity to particular diseases. Vaccines are injected via a hypodermic needle or given orally by mouth. There are many different types of vaccines, but all aim to do the same thing, reduce the risk of contracting potentially deadly diseases such as polio and chicken pox. Due to the availability of vaccines, diseases such as small pox have been wiped out.
There are many different species of animals in the world. They are all different, but uniquely adapted for the habitat/s which they occupy. So which animal in the world holds the record for being the biggest? Read on to find out.
Matthew Perry is a celebrity actor who is most famous for his role as “Chandler Bing” on the hit television series “Friends.” However, during, and since, filming for “Friends” he managed for forge a successful career in film. Interestingly, his career actually started 15 years before “Friends” with many guest roles on television and small budget movies. His first major film was the 1997 comedy “Fools Rush In” and more quickly followed. This is a list of movies that Matthew Perry has acted in during his career so far.
Paper is used every day in a thousand different ways. From newspapers, books and magazines to paper plates, scrap paper and toilet paper – paper is everywhere. America alones used a staggering 68 million tons of paper per year. With so much paper used every day it is no wonder that countries around the world are working hard to recycle paper to be used again. So how is paper recycled? Read on to find out.
Tungsten is a steel metal and is found naturally on the earth. It is also called wolfram and has the chemical symbol of W. It was identified as a new element in 1781, and first isolated as a metal in 1783. It is sought after due to having the highest melting point of all non-alloyed substances on earth. Here are some of the most common uses of Tungsten in the world today!
Pollution can come in many forms, but is nay substance that is introduced into a natural environment that is harmful or poisonous. It can be chemical substances or energy such as noise, heat or light. One of the most polluted environments on the earth is the ocean. Every year thousands of marine creatures die because of pollution and even more are damaged or made sick due to it. So what causes the oceans to be polluted?
Earthquakes occur when the tectonic plates that make up the earth’s crust interact with one another. Some earthquakes are caused by the plates moving passed one another and others are caused by one plate sliding under the other. The size of an earthquake depends on the amount of force that has built up at the point of contact. Sometimes the plates moving causes only a slight tremor, whereas in other instances the movement can cause cataclysmic destruction. So how are earthquakes measured? Read this article to find out.