Final answer:
Steel is not a natural resource, whereas precious stones, fossil fuels, and lumber are natural resources.
Step-by-step explanation:
Steel is not a natural resource because it is a man-made material that requires the extraction and processing of iron ore and other additives. Natural resources are substances that are found in the environment and can be used to meet human needs. Examples of natural resources include precious stones, fossil fuels, and lumber. Precious stones like diamonds and rubies are mined from the earth, fossil fuels like coal and oil are formed from ancient organic matter, and lumber comes from trees that grow naturally in forests.
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