The horizon layer where you can find roots of plants.
What is horizon "A"?
100
Various types of physical weathering provide bits of ___________for soil formation.
What is rock?
100
Part of soil that is made up of decayed organic materials.
What is humus?
100
_______________grow in areas with thin topsoil and limited humus. Frequent heavy rainfall carries minerals deep into the ground.
What is Forests?
100
Add nutrients to the ground.
What is fertilizing?
200
The horizon layer that has less humus and lots of fine particles of rock.
What is "B" horizon?
200
Decayed _____________such as grass, are an important part of the soil that allow more complex plant organisms to grow.
What is plants?
200
Another name for the soil in the "A" horizon.
What is topsoil?
200
Type of soil that is rich in minerals because it receives little rain_______________________.
What is desert soil?
200
Planting different crops every year to replace nutrients.
What is crop rotation?
300
The horizon that has larger pieces of weathered rock.
What is "C horizon"?
300
At the beginning of soil formation, basic plants grow in weathered rocks. This attracts ____________to come and live and eventually die and become part of the soil.
What is animals?
300
Another name for the soil found in the "B" horizon. This soil contains lots of fine particles of rock that make up clay.
What is subsoil?
300
Corn, wheat, and rye grow best on this type of soil.
What is grassland soil?
300
___________________are tall trees planted to reduce the amount of wind blowing across a field.
What is wind breaks?
400
The soil horizon where topsoil is found.
What is horizon "A"?
400
Spaces in soil contain this gas ___________, that allows organisms to live.
What is oxygen?
400
The biggest component (primary ingredient) of soil.
What is weathered rock?
400
Soil is a _______________resource.
What is natural?
400
Farmers can reduce water erosion by using _________ plowing.
What is contour?
500
The soil horizon where subsoil is found.
What is "B" Horizon?
500
Soil also has the ability to hold _____________which is another ingredient found in soil.
What is water?
500
Humus contains _____________that feed plants.
What is nutrients?
500
Soil can become ______________by chemicals released onto the ground. It can also become ____________ with chemicals used to kill insects and weeds.
What is polluted?
500
Planting grasses between rows of other crops to prevent erosion.