NSES Content Standard B
Physical Science: Properties of objects and materials Grades K-4, page 127 Objects are made of one or more materials, such as paper, wood, and
metal. Objects can be described by the properties of the materials from
which they are made, and those properties can be used to separate or sort
a group of objects or materials.
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Benchmark 8B The Designed World: Materials
and Manufacturing
Grades 3-5, page 188
Naturally occurring materials such as wood, clay, cotton, and animal
skins may be processed or combined with other materials to change their
properties.