Soil Conservation

Sod is 

• thick mass of tough roots at the surface of the soil.
• humus
• litter
• decomposer

Soil on Earth is one of it's 

• major source of dirt
• major inconvenience
• is not a resource
• resource

Anything that humans can use from the environment is called a 

• gift
• exploitation
• natural resource
• unnatural resource

Soil can be lost to erosion

• wherever there is no plant cover.
• wherever there is a plant cover
• all the time.

The cause of soil loss on the Great Plains in the 1930's  was 

• erosion by water
• wind erosion
• erosion by both wind and water

Soil can be lost to erosion by 

• only water
• only wind
• by both water and wind

The value of soil is reduced when soil 

• loses it fertility
• top soil is lost due to erosion
• all of the above mentioned answers

What was the reason for the exposure of soil in the Great Plains in 1930?

• crop rotation
• conservation plowing
• Plowing

In conservation plowing

• plant cover is pulled out after each harvest.
• is the same as contour plowing.
• disturbs the soil and its plant cover as little as possible.