Ores are naturally occuring rocks that contain metal or metal compounds in sufficient amounts to make si worthwhile e.g iron ore is used to make iron and steel.
Aluminium and titanium are metals that are useful but are expensive to extract.
Most everyday metals are mixtures called alloys.
The earth's crust contains metal oxide and metal compounds such as iron oxide,gold and aluminium oxide, but when found, there are often mixed with other substances.
Metals are very useful. Ores are naturally occurring rocks that contain metal or metal compounds in sufficient amounts to make it worthwhile extracting them. For example, iron ore is used to make iron and steel. Copper is easily extracted, but ores rich in copper are becoming more difficult to find. Aluminium and titanium are metals with useful properties, but they are expensive to extract. Most everyday metals are mixtures called alloys.
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