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.
 

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 
Science and Technology: Abilities to distinguish between natural objects and objects made by humans
Grades K-4, page 138
Some objects occur in nature; others have been designed and made by people to solve human problems and enhance the quality of life.

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.