Air pollution is caused by many things the increasing number of cars on our roads growing cities the fast development of our economy industrialisation Air pollution, as we know it today, started with the Industrial Revolution in Europe in the 19th century. In the last few decades, it has become the major problem for ourenvironment. Clean air is normally made up of nitrogen (76 %) , oxygen (22%) , carbon […]
The oil spill in the Gulf of Mexico is one of the largest oil spills in history. In the months that followed the disaster millions of litres of oil flowed out into the ocean. The oil leak off the coast of Louisiana is even greater than the Exxon Valdez disaster which occurred off the coast of Alaska when a tanker ran aground in 1989. On April 20, […]
Ozone is a kind of oxygen in which each molecule has three atoms instead of two. The formula is O3 . Ozone is often produced when electricity passes through the air. That is why there is often an unpleasant smell after a thunderstorm or around electrical equipment . Ozone is a blue gas that is explosive and poisonous .It is denser than oxygenand condenses into a dark blue liquid at – 112° C. This liquid freezes […]
The carbon footprint shows how much carbon dioxide and other greenhouse gases a person produces in everyday life. It measures the amount of fossil fuels and electricity someone uses up as well as the carbon footprint of the products they buy. When we use our cars or heat our homes with oil or natural gas, carbon dioxide andvarious other gases are set free. These emissions lead to a denser atmosphereand global warming. You […]
Carbon dioxide is a compound in which two oxygen atoms are connected to acarbon atom. At normal temperatures it is a colourless gas that exists naturally in the Earth’s atmosphere. The air that we breathe has about 0.03% of carbon dioxide in it. Carbon dioxide is an important part of the carbon cycle and essential for life on Earth. Without it temperatures on our planet would be very low. Plants […]
Whales have been hunted for their meat and oil for centuries. In the 18th and 19th century, whaling became an industry. As time went on, whaling fleets caught more whales than the animals could reproduce. By 1930, 50,000 whales were killed every year. In the 20th century factory ships revolutionized the whaling business. Whales were caught and processed on board. Advanced technology made it possible to track whales in the water. […]
Some American high schools have a dropout rate of up to 50%. There are many reasons for students leaving school : For two thirds of the dropouts motivation is the problem. They can’t just work hard enough. Almost half of them said that they had missed so many classes that they could notcatch up any more. Many said that […]
A research report says that virtual worlds can be important places where children practice what they will do in real life. They are also a powerful and attractivealternative to more passive adventures like watching TV. The research was done with children using the BBC’s Adventure Rock virtual world, aimed at those aged 6-12.It surveyed and interviewed children who were the first to test the game. The […]
How do you sell things in a time when the economy is down and people just don’t want to buy? Try the 99 cent approach. Steve Jobs, boss of Apple Computers tried it and probably saved the music industry. He chose a standard price of 99 cents for each song that he wanted to sell on iTunes […]
President Barack Obama has signed a bill which he hopes will get the United States economy moving again. At a ceremony in Denver, Colorado Obama signedthe American Recovery and Reinvestment Act (ARRA). About 787 billion dollars will be pumped into the economy. ARRA is to fight the worst American economicdisaster since the Great Depression. The President said that the new law is not the end of the nation’s economic problems but it is […]