Calcium is a soft, silvery white metallic element which reacts with water and oxygen. It is believed calcium makes up 3.6 percent of the earth's crust and is found in nature as compounds. Calcium carbonate forms limestone, chalk and marble. Calcium sulphate occurs as gypsum. Pure calcium is used in certain alloys and various forms of calcium is used in industry. Humans need calcium for strong healthy bones an teeth, we get calcium from eating green vegetables and milk products.
How is pure calcium obtained? You will need to look in an encyclopaedia to answer this question. Find out some uses in industry were calcium is used and write your findings. If you can find relevant pictures place them with your written project.
©2000 Teaching Treasures™ Publications