Natural substances become resources only when their _______ form has been changed.
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Sometimes, natural substances become resources only when their original form has been changed. ... People use natural resources to make buildings, bridges, roads, machinery and vehicles, which are known as human made resources. Technology is also a human made resource.
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Answer: Sometimes, natural substances become resources only when their original form has been changed. ... People use natural resources to make buildings, bridges, roads, machinery and vehicles, which are known as human made resources. Technology is also a human made resource .
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