Conservation for the Nation
In the 1930's the Mid-Plains were known as the ____ Bowl.
Dust Bowl
The idea that the earth is divided into different sections is called ____.
Plate techtonics
What river carries 325 million tons of soil away each year.
Mississippi River
Around 180 million people in Africa don't have access to enough ____.
Food
20% of the land in the U.S. can do what?
Raise crops
If water stands on a ground for a long time the plant roots don't get enough ____.
Oxygen
An ideal soil for agricultural use is ____.
Loam
One very important burrowing animal is the ____.
Earthworm
The different layers of the soil are known as _____.
Horizons
The R horizon is called ___.
Bedrock
Soil is 45% minerals, ___%air, ___%water, and ___% organic matter.
25% air, 25% water, 5% organic matter
Alfalfa and beans can put this nutrient back into the soil?
Nitrogen
Pedology is the study of _____.
Soils
Friable soil means it will ____ easily.
Crumble
When water moves through the soil carrying nutrients with it this is known as ____.
Leaching
A method that uses less cultivation to control weeds and prepare soil is called ____ tillage.
Reduced
Farming cutting across the slope instead of up and down the slope is known as ____ farming.
Contour
Blueberries and potatoes grow best in what kind of soil?
Acidic
Delayed warming of the soil, reducing evaporation, high residue holds pests and diseases is caused by ____.
Conservation tillage
The four things that can cause erosion are: 1) waves, 2)glaciers, 3) moving water, & 4)_______.
Wind
The 5 factors that form soil are: 1) parent material, 2)topography, 3) time, 4) biological factors, and 5)_____.
Climate