Kev is probably correct, about the rusted pipe. I did not see letters in the next to last pictures. Iron, coal and tress are all carbon based. When water combines with a variety of minerals such as feldspar and many others, a slow process turns this mass into quartz which is same as agate, opal and petrified wood. All kinds of stuff starts as natural gets converted and then eventually returns to natural matter over time. Polyester, nylon and more are carbon based petroleum and made into products used by humans. If you bury cloth it eventually rots and return to soil and the process begins again. The process is slow. "Natural" fibers such as cotton wool, silk and hemp are also carbon based and manipulated by humans. Moisture speeds up the process but nature can not keep pace with human production of waste. My mother used to burn most trash including cans. She told me that burning to coating off the cans speeds up the rusting process and returns the material to soil. After a few years burned trash was no longer.....it had returned to soil. Of course with chemical analysis it could be determined what had bee added to the soil. Any way everything starts out natural.
Ohhh Boy How Did I Start THIS LECTURE But seriously out planet is filling up with trash even without landfills which people rarely think about.
