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International Rock Day

Hello everyone, 

Do you like Geology? And Petrology? 
International Rock Day is on July 13. It's not about Rock and Roll music; it's about the stone variety. 
Rocks are made of minerals: calcite, quartz, feldspar, biotite...
How many types of rocks can you name? 
Look at this picture:


Picture: Wikimedia


Do you think rocks are important for humans?  They are very important and they have been used for different purposes over the years. 
Have you ever painted on a rock? Look at these art projects. 

1) Macro-schematic Art can be found in some place in Alicante province and the famous painting "El Orante" can be seen in "The Sanctuary of Pla de Petarcos", which is Cultural Interest and Heritage of Humanity element, located in Castell de Castells.  





2) Painting on rocks which have got different shapes can be funny.




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