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Calcium oxide (Ca O), commonly known as quicklime or burnt lime, is a widely used chemical compound.

It is a white, caustic, alkaline, crystalline solid at room temperature.

Iron in hemoglobin carries oxygen around our bodies. Close up of an iron meteorite: Meteorites such as this one were probably our ancestors’ first source of iron.There are reports of copper beads dating back to 9000BC found in Iraq.Methods for refining copper from its ores were discovered around 5000BC and a 1000 or so years later it was being used in pottery in North Africa.Carbon is unique in its chemical properties because it forms a number of components superior than the total addition of all the other elements in combination with each other.The biggest group of all these components is the one formed by carbon and hydrogen.

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