Ytterbium is a naturally occuring rare earth element. However, an isotope of Ytterbium (Ytterbium-169) is an artificially produced isotope.
ytterbium man made
It is natural but there are man-made imitations.
It can be made from natural or man made fibres.
Is limestone natural or man made
Man made.
ytterbium man made
Suig my Nids
It is natural but there are man-made imitations.
It can be made from natural or man made fibres.
Is limestone natural or man made
natural feature
Man-made and Natural Resources
Ceramic is man-made from a natural material.
Is limestone natural or man made
Is limestone natural or man made
No "NATURAL" calamities are man made.
Satellites can be natural, and satellites can be man-made. They cannot be both. Satellites are either natural or man-made.