(carrega nas imagens para veres em grande)
PIROCLASTOS:
BIBLIOGRAFIA:
http://geomuseu.ist.utl.pt/MINGEO2010/Questionarios/Petrologia%20e%20petrografia/Visualiza%E7%E3o%20-%20rochas%20%EDgneas/Obsidiana.jpg
http://www.google.pt/images?hl=pt-PT&gbv=2&tbs=isch%3A1&sa=1&q=pedra-pomes&aq=f&aqi=g1&aql=&oq=&gs_rfai
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9lLzJkt4isjXRdFdI9vdqoGreln-NBjBd_UoYRUfsqK5c3zlmY5jo-Io8kIO6JNFrqtE-Rmh6goGYgOGLXYGwtI-QbdbVMm7xcFZ4rYyjdkK339SLv4tUUeYablzURN9T3xCWasT4HxJj/s320/dolerito%252067.gif
http://www.southwestbirders.com/Hawaii_2002/lava%20flow%20i.jpg
http://filipedebarros.files.wordpress.com/2009/04/piroclastos11.jpg
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