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.
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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.