Envirothon Soil Part 2

The breakdown of rock into smaller pieces by physical means; common causes are ice, wind, water, gravity, plants, and animals

• Physical (Mechanical) Weathering 
• Chemical Weathering

Which of the following is NOT a major soil forming factor?

• Time, Topography
• Climate, Parent Material
• Organics (organisms)
• Deposition

Indicators of soil quality are categorized into four general groups:

• land use, organics, saturation, physical
• color, chemical, texture, microbial
• biological, color, physical, organics
• visual, physical, chemical, biological

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

In which horizon is most of the HUMUS?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

Soil permeability is most greatly affected by:

• Soil structure
• Soil texture
• soil organic matter
• all of the above

Which of the following is the largest particle in soil?

• sand
• silt
• humus
• clay

Which ones does not represent soil texture:

• Silt
• Clay
• Humus
• Sand

Which horizon contains clay, silt, minerals, and a little humus?

•  Horizon A
• Horizon B
• Horizon C
• Horizon D or R

Which horizon is made up of partially weathered rocks?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R