SOIL. SOL 3.1 & 3.7. Soil provides. support and nutrients for plant growth. EROSION is the movement of sediment and rock to new places. Weathering. breaks down rocks to create soil. It can be caused by weather, water, or living things. There are five components of soil:. 1. Rock
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SOL 3.1 & 3.7
support and nutrients
for plant growth
breaks down rocks to create soil. It can be caused by weather, water, or living things
Rock is solid and made of minerals
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
Topsoil(The layer on TOP)
Subsoil(The prefix SUB means under)
Bedrock(It’s hard as rock down there!)