• 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

Google ➔ Dictionary ➔ Image ➔ YouGlish