Density of ores and rocks

Have you tried the Earthlearningidea 'Eureka! - detecting ore the Archimedes way'? A rock that feels heavy may contain mineral ores. But how can we find out if rocks that feel heavy for their size really are more dense than ordinary rocks? The simple way to find out is to use the method discovered by the famous scientist Archimedes more than 2000 years ago. To investigate if something is heavy for its size (has a high density) or light for its size (low density) we need to measure how heavy it is (its mass) and what size it is (its volume).
You can do all this if you try this activity.
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