NSES Content Standard E
Science and Technology: Abilities to distinguish between natural objects and objects made by humans Grades K-4, page 138 Objects can be categorized into two groups, natural and designed.
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Benchmark 8B The Designed World: Materials
and Manufacturing
Grades 3-5, page 188
Through science and technology, a wide variety of materials that do
not appear in nature at all have become available, ranging from steel to
nylon to liquid crystals.