man-made structures were made by humans, but natural structures made itself.
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The difference between a human-made system and a "natural" system will depend entirely on what the system is. In many cases the human system will be simpler and have a narrow focus.
Man-made fabrics are produced using chemical processes, such as polyester and nylon, while natural fabrics are derived from natural sources like cotton and wool. Natural fabrics are breathable and biodegradable, while man-made fabrics often offer more durability and resistance to wrinkles and stains.
Synthetic refers to something that is man-made or artificially created, while natural refers to something that occurs in nature without human intervention. Synthetic products are often created using chemicals or industrial processes, while natural products are derived from plants, animals, or minerals.
Compressed natural gas (CNG) is the same as natural gas - the only difference is in the form in which they are stored. CNG is natural gas that has been compressed to reduce its volume for storage and transport, while natural gas is found in its uncompressed form underground.
A natural hazard is a threat caused by natural phenomena, such as earthquakes or hurricanes, while a man-made hazard is a threat resulting from human activities, like pollution or industrial accidents. For example, an earthquake is a natural hazard, while a nuclear power plant meltdown is a man-made hazard.