Field Biology Soil

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 (relief)

• Climate, Parent Material

• Organics (organisms)

• Deposition

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

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following is the largest particle in soil?

• sand
• silt
• humus
• clay

Which of the following 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 parent material?

• Horizon A

• Horizon B

• Horizon C

• Horizon D or R

Ellen grabs a topsoil sample in her hand. She rolls it into a ball. The soil feels gritty and the ball falls apart. What part of the topsoil most likely made the topsoil feel gritty?

• clay
• sand
• silt
• humus