This document discusses the components and layers of soil. It explains that soil is made up of five main components: rock, sand, silt, clay, and humus. These components provide structure and nutrients to support plant growth. The document also describes three layers of soil - topsoil, subsoil, and bedrock - and emphasizes the importance of conserving soil as a natural resource through practices like planting trees, grass, and gardens.

1. SOIL
SOL 3.1 & 3.7

2. Soil provides
support and nutrients
for plant growth

3. EROSION
is the movement of sediment and
rock to new places.

4. Weathering
breaks down rocks to create soil.
It can be caused by weather,
water, or living things

5. There are five components of soil:
• 1. Rock
• 2. Sand
• 3. Silt
• 4. Clay
• 5. Humus
• Can you match each type of soil to its picture?

6. Rock
Rock is solid and made of minerals

7. Sand
Sand is tiny grains of worn down rock. It
doesn’t hold water or have many nutrients.

8. Silt
Silt is very small, broken pieces of rock. It is
larger than clay, but smaller than sand. It
is powdery when dry.
Sand ------------Silt---------------Clay
(smaller particles) (larger particles)

9. CLAY
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.

10. Humus
Humus is made of leaves, twigs, small
animals, or other decayed substances.
Humus adds many nutrients to the soil.
Humus is in the topsoil.

11. 3 Layers of Soil
• Topsoil (The layer on TOP)
• Subsoil (The prefix SUB means under)
• Bedrock (It’s hard as rock down there!)

12. Natural Resources
• Made by NATURE
• Cannot be replaced
• Must be conserved (saved)!

13. Ways to Conserve Soil
• Plant trees
• Plant grass
• Healthy farming
• Plant gardens to grow crops
• What else can you do to conserve soil?