NSES Content Standard D 
Earth and Space Science: Properties of Earth materials 
Grades K-4, page 134 

Soils have properties of color and texture, capacity to retain water, and ability to support the growth of many kinds of plants, including those in our food supply. 

Benchmark 4C The Physical Setting: Processes that Shape the Earth
Grades 3-5, page 72
Rock is composed of different combinations of minerals. Smaller rocks come from the breakage and weathering of bedrock and larger rocks. Soil is made partly from weathered rock, partly from plant remains--and also contains many living organisms.