Some of the broken-down rocks, along with associated plant and animal
matter, develop into soils. When you examine soil with a magnifying
glass, you may be able to see some of the small rock and mineral grains
that still remain in it. Some soils have formed on top of the rocks from
which they came, and some have been moved in from another place.
[Illustration: Soils develop from weathered rock and associated organic
material.]
SOIL
SUBSOIL
WEATHERED ROCK
BEDROCK