natural
the major components of environment are natural environment, man made environment and human environment
Silver is natural, human can not made it.
Oxygen is naturally made. It is the by-product of photosynthesis which every plant on the planet undergoes.
Oxygen and Hydrogen
An example of a natural disaster would be the earthquake in Haiti. An example of a human-made disaster would be the London Fire.
All objects and materials on Earth are either Natural Resources or human-made. Natural resources come from the Earth, and are not synthesized in any way by humans. Human-made objects are made when humans manipulate natural resources in order to change their function in some way.
Natural...
A thing which was made by man and not natural
The Amazon river/rain forest is a natural feature, not a man made feature.
The human body is made up of only mostly carbon, oxygen, hydrogen, nitrogen, calcium, and phosphorus. The top four elements are oxygen, carbon, hydrogen and nitrogen, so that would be a. on your list.
Its defiantly Human made.
natural environment,human environment,human made environment.