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Mechanical
Chemical
Why is soil important?
Harmful to soil...
Soil conservation
100
The type of force that breaks down rocks mechanically.
What is physical.
100
For chemical weathering to occur, a _____________ reaction has to happen.
What is chemical.
100
Trees need soil. Trees give us this.
What is air.
100
Farmers add this to soil to help plants grow.
What is fertilizer.
100
Placing different crops in the same soil to balance the nutrients.
What is crop rotation.
200
When water freezes in the cracks of a rock and expands, this causes the rocks to break apart. This is known as __________.
What is ice wedging.
200
The two main causes of a chemical reaction.
What is water and air.
200
Soil grows crops. We need crops for this.
What is food.
200
7When farmers remove surrounding trees and plants, the soil is left unprotected. When unprotected it can _____________ ______________.
What is blow away.
200
Reducing the number of times a patch of soil is plowed.
What is conservation tillage.
300
This part of the tree is strong enough to crack through rocks.
What is the roots.
300
As we saw in our antacid lab, some minerals ____________ when mixed with water.
What is dissolve.
300
Plants grow this type of material for our clothing.
What is cotton.
300
When cows and horses eat too much grass it is refered to as ____________.
What is overgrazing.
300
Flat, steplike areas that hold water and stop it from running downhill.
What is terraces.
400
Also called onion-skin weathering, this type of weathering causes the rocks to peel away in layers.
What is exfoliation.
400
Also know as Iron Oxide.
What is rust.
400
Some plants keep us healthy because they produce this.
What is medicine.
400
Expansion of desert conditions due to the lack of natural plant cover.
What is desertification.
400
Plowing on a curve to help plants absorb that water instead of it flooding at the bottom.
What is contour plowing.
500
This occurs when friction breaks down a rock.
What is abrasion.
500
If a rock has only changed its appearance, then it has not gone through a ____________ change.
What is chemical.
500
We need this to build homes. Without soil this couldn't be produced.
What is lumber.
500
If soil builds up in rivers and streams from being blown away, it causes this.
What is flooding.
500
Rows of trees are planted between fields the help stop soil loss.
What is wind breaks.