Naturally occurring materials such as wood, clay, cotton, and animal
skins may be processed or combined with other materials to change their
properties.
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. NSES Content Standard E
NSES Content Standard E
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