SOIL

• Soil
• Humus
• Bedrock

DEFINITIONS

• Soil: mix of humus, sediments, air, & water
• Humus: Material rich in carbon;made by organism
• Bedrock: solid rock under soil

First, bedrock is weathered and eventually, humus is added to the top. Leeching carries humus down.

Organic-Humus
A-Topsoil
B-Subsoil
C-Rock fragments

Soil Texture triangle. Use precents to find soil type.

CONCLUSION

• Soil
• Humus
• Bedrock

SOURCES

• Brainpop
• grist.org
• pinterest.com
• eschooltoday.com
• Interactive Science
• soils4teachers.org