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The early knowledge of iron comes from meteorites as we already mentioned. Early humans thought that these huge stones fell from heaven. Iron was the prominent element in the meteorites that fell on Earth. Many of them were made of up to 90 per cent iron. Therefore, iron was referred to and was described as ‘celestial stone’ in many ancient texts.

Hundreds of meteorites hit the surface of the earth every year. Some of these meteorites were really huge. One of the heaviest meteorites ever found is called the Hoba. This meteorite weighed about 60 tons.

In 1894, the polar explorer Robert Peary found a meteorite weighing 33 tons in Greenland. A gigantic iron meteorite hit the Arizona desert in prehistoric times leaving a crater that is 1200 metres in diameter and over 175 metres deep. The crater exists in Arizona even today.

Till about 1500 BC, iron was not a popular metal. Why was this so though iron was abundant on Earth? This was because of the difficulty in extracting iron, though the Hittites in West Asia did learn how to use it.

The Hittites kept the secret of making iron for about 400 years! They found out that iron weapons were better than bronze ones and that is why they decided not to tell anybody else how to make iron. The secret of making iron came to India with the Aryans. The Aryans invaded India around 1500 BC. People who lived in China learned how to make iron by around 700 or 600 BC. By about 300 AD, people in West Africa and East Africa too had learned the secrets of making iron.

Some people treasured iron more than gold as it was a rarity. Iron jewellery was worn by only the wealthiest people, and in ancient Rome, even wedding rings were made of iron! Though iron gradually became more easily available and cheaper, some tribes still considered it precious.

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The earth’s core is believed to consist largely of an iron-nickel alloy. In fact, iron makes up about 5 per cent of the Earth’s crust. Most of the iron in the Earth’s crust is combined with oxygen. Therefore, it is much more difficult to extract iron than other metals like copper.

Iron is extracted from iron ore in a huge steel column called a blast furnace. Coke, limestone and hot air are essential for the extraction of iron from its ore.

The blast furnace is heated by burning coke. When the coke burns, it produces carbon dioxide. The carbon dioxide reacts with more coke to produce a gas called carbon monoxide, which in turn reacts with the iron oxide in the iron ore to produce molten iron. The molten iron is then purified using limestone, and allowed to cool in moulds to produce cast iron.

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Some elements are essential for the normal growth and development of plant and animal life. Such elements are known as bioelements.

Plant life will be doomed if copper is not present on Earth. We all know that plants prepare food with the help of chlorophyll. Copper is essential for the production of chlorophyll; without it, the chlorophyll content of leaves would be reduced, turning them yellow. The plant would not be able to bear fruits and would eventually die.

Copper is necessary for animal life and human life too. Copper plays a crucial role in human growth. Copper is essential for bone strength, the maturation of red and white blood cells, cholesterol and glucose metabolism, the contraction of heart muscles, and brain development. Copper deficiency can lead to health problems such as anaemia, heart problems, bone abnormalities and complications in the functioning of the nervous and immune systems.

Your parents encourage you to eat iron-rich foods like spinach, lentils and dry fruits. Some of you might have been advised by doctors to take iron tablets for iron deficiency. But why do we need iron in our diet? Iron is an integral part of many proteins and enzymes that maintain good health in human beings and animals. So, all of us are iron boys and iron girls in this way!

Iron is one of the most abundant metals on Earth. This element is essential for plant and animal life. Plants need iron for the formation of chlorophyll, and for respiration. If a person’s blood does not have enough iron in it, he or she will become tired easily and suffer from frequent headaches. In fact, iron is vital for the production of haemoglobin, which gives blood its red hue.

Though it was known that iron has medicinal properties right from ancient times, the presence of iron in human blood was not discovered until the 19th century.

A chemical compound is obtained when two or more chemical elements are combined in definite proportions. The proportion of the elements is defined by weight. Some of the chemical compounds are useful to humankind.

Copper sulphate is one of the most important compounds of copper; it is used to refine copper. Copper sulphate has some agricultural uses as well. It is used as the base for many fungicides and also as an additive in animal feed. Copper oxide is used to make blue or green glazes in pottery. It is also used to colour artificial gems and glass.

Copper chloride is often used as a disinfectant. It is used for dyeing clothes and in textile printing too. Further it is used as a catalyst in many organic and inorganic reactions. While these compounds are useful to humans some of these compounds of copper can cause severe health problems as well.