Time zones are entirely man made. Some countries or states get by without them, whereas adjacent regions do have them.
The natural part is just that the Sun gets to lands in the west later in the day, but (apart from polar regions) all places "will have their place in the sun" each day.
a timezone is natural
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
No "NATURAL" calamities are man made.
Is limestone natural or man made
Ceramic is man-made from a natural material.
Is limestone natural or man made
Satellites can be natural, and satellites can be man-made. They cannot be both. Satellites are either natural or man-made.
The oceans are NATURAL made.(made my nature).A building, some lakes, are MAN made.(made by man).
feathers are not man made they are natural