crust ⪢⪢
http://qindex.info/i.php?x=11979
 crust ⪢⪢
http://qindex.info/i.php?x=18708
○○○ silicate ⪢⪢
-- crust, silicon, feldspar, quartz, potassium, plasioclase
http://qindex.info/i.php?x=10958
○○○ bedrock ⪢⪢
Finally and most importantly, mountains have deformed bedrock, meaning the layers of rock beneath the surface have been folded, faulted and tilted by the movement of Earth's crust.
http://qindex.info/i.php?x=16113
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