Benchmark 4D: The Physical Setting - The Structure of Matter
(grades K-2, page 76)
 

Objects can be described in terms of the materials they are made of (clay, cloth, paper, etc.) and their physical properties (color, size, shape, weight, texture, flexibility, etc.). (1 of 2)

Standard 2-1 page 26, Grades K-4
Relate physical materials, pictures, and diagrams to mathematical ideas