Photo taken from Google-:
The ground we walk on recycled. Earth's rock cycle transforms igneous to sedimentary rocks to metamorphic rocks and back again. The cycle isn't a perfect circle, but the basics work like this: Magma from deep in the Earth emerges and hardens into rock. Tectonic processes uplift that rock to the surface, where erosion shaves bits off. These tiny fragments get deposited and buried, and the the pressure from above compacts them into sedimentary rocks. If sedimentary rocks get buried even deeper, they "cook" into metamorphic rocks uber lots of pressure and heat.
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Interesting.
I knew it was recicled but didn't knew how.
Read that article~http://www.makeandtakes.com/reduce-reuse-recycle-for-earth-day after your doubt is cleard!