It is manufactured.
"Synthetic" could be another word for something that does not occur naturally.
The isotopes are not manufactured for specific uses, they occur in nature naturally.
Yes. Mostly by wind, water and ice.
All existing products which do not occur naturally are manufactured. This includes items as diverse as computers, phones, toys, clothing, cars, musical instruments, and everything else which does not occur in nature.
Sublimation occurs naturally on Earth. Snow and ice can sublimate slowly in hot sun.
Sodium fluoride is a compound that can be found in nature, but it is most commonly manufactured for various industrial and consumer applications, including water fluoridation, toothpaste, and insecticides.
At atmospheric pressure, sublimation/deposition occurs at −78.5 °C (−109.3 °F). However, there is relatively little CO2 in the atmosphere, so you certainly won't get 'snow' or 'sheets of ice' from it. At best you'll get a little bit of dry ice 'frost'.
LSD does not naturally occur. The things that would destroy manufactured LSD would happen regardless of whether it coats food.
It grows naturally.
Things that are natural are not made by people and they occur naturally in the environment. Things that are manufactured are built by people and are mostly modelled after natural structures. Natural and manufacture are both opposites to each other.
Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.Rivers are not built, they occur naturally, so there is no year that the river Lee was built.
in there native state