It can be naturally ocurring, but is typically synthesized in a laboratory for commercial sale. It is synthesized from natural gas and nitrogen from the air.
It is natural but there are man-made imitations.
It can be made from natural or man made fibres.
Rubber is man-made but has natural agents.
Is limestone natural or man made
Coal is a natural mineral. You might be confusing this with charcoal which is man-made.
It is natural but there are man-made imitations.
It can be made from natural or man made fibres.
natural feature
Is limestone natural or man made
Man-made and Natural Resources
it is all natural
Rubber is man-made but has natural agents.
No "NATURAL" calamities are man made.
Is limestone natural or man made
Ceramic is man-made from a natural material.
some is natural but some is man made
Is limestone natural or man made