Marbles are naturally produced by nature, hence, a marble is a non-foliated metamorphic rock composed of recrystallized carbonate minerals, most commonly calciteor dolomite (wikipedia). However, marbles have been used as building materials during construction, and so men do play a part in shaping these marbles into ones we frequently see as walls or floors tiles in buildings.
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