Sand is tiny grains of worn down rock. It
doesn’t hold water or have many nutrients.
Silt is very small, broken pieces of rock. It is
larger than clay, but smaller than sand. It
is powdery when dry.
(smaller particles) (larger particles)
Clay holds water well. It is sticky and can
be shaped when it is wet. But, it is very
hard when dry.
Clay has many nutrients.
Clay is used for adobe or brick houses.
Humus is made of leaves, twigs, small
animals, or other decayed substances.
Humus adds many nutrients to the soil.
Humus is in the topsoil.
3 Layers of Soil
1. Topsoil (The layer on TOP)
2. Subsoil (The prefix SUB means under)
3. Bedrock (It’s hard as rock down there!)
• Made by NATURE
• Cannot be replaced
• Must be conserved (saved)!
Ways to Conserve Soil
• Plant trees
• Plant grass
• Healthy farming
• Plant gardens to grow crops
• What else can you do to conserve soil?
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.