Why is soil an important resource?

What is humus?

• organic material rich in nutrients
• subsoil
• parent material
• trees

Why is soil an important natural resource?

• soil is used to make buildings
• soil can grow crops
• soil comes from bedrock
• soil is full of mircobes

Which of these slows down soil erosion on construction sites?

• clear cutting
• strip mining
• contour plowing
• sandbags and nylon fencing

Two methods of soil conservation in farming are

• reclamation and subsurface mining
• landscaping and nylon fencing
• selective harvesting and replanting
• contour plowing and windbreaks

What type of erosion is slowed down by contour plowing and terracing?

• wind
• water
• air

Which of the following soil types would contain the most nutrients?

• Soil with many large rock particles
• Soil with bedrock close to the surface
• soil that drains well through it
• soil with decomposed organic material

What is a solution to stop wind erosion on a farmer's field?

• Plow up all of the plants
• Build a pond
• plant trees and shrubs on the edge

What is a major cause of soil erosion?

• Running Water

• Overgrazing

• Agricultural Activities

What research focus was soil erosion?

• Effects on the Atmosphere

• Effects on Climate

• Population Growth

• Effects on Water

• Effects on Land

What is the least cause of Soil Erosion?

• Industrialization

• Agricultural Activities

• Deforestation

• Overgrazing

• Over Exploitation