Lead is an element and is natural, but is not often found in its pure state. It is usually found in an ore that has a lead compound and a mixture of other compounds of other metals. It is then refined to produce more pure lead metal.
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Lead is a naturally occurring element found in the Earth's crust. However, lead can also be produced synthetically through industrial processes.
Lead is a naturally occurring element. It was known to ancients, and some lead pipes survive from Roman times.
Meitnerium is a synthetic radioactive element. It is not found in nature.
AlKS2O8 is synthetic compound created by chemists in laboratory settings. It is not commonly found in nature.
Valium, also known as diazepam, is a synthetic drug and is not found in nature. It is classified as a benzodiazepine and is produced through chemical synthesis in a laboratory setting.
Teflon is a synthetic material made from compounds like polytetrafluoroethylene (PTFE). It is not found in nature and is produced through chemical processes.
Natural fibres have been found or have been raised, though synthetic fibres have been man made. synthetic fibers have been made in a factory of some sort and natural fibers have been made by something that can be found in nature