Chunks of rocks come in many sizes and shapes, from boulders to grains of sand and even smaller.
The most closely related standard is at a higher level of sophistication.
| NSES Content Standard D
Earth and Space Science: Structure of the Earth system Grades 5-8, page 160 Soil consists of weathered rocks, decomposed organic material from dead plants, animals, and bacteria. Soils are often found in layers, with each having a different chemical composition and texture. |