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Type of mechanical weathering
Freeze Thaw
Horizons
Name for the layers of soil
Ideal organic matter %
5%
ideal mineral matter %
45%
Breakdown of rocks by chemical alsteration
chemical weathering
Breakdown of rocks by living organisms
Biological weathering
Physical breakdown of rock to smaller fragments without chemical change
Mechanical weathering
A type of chemical weathering
Hydrolysis
The total volume of soil occupied by soil pores
Porosity
Definition for porosity
The total volume of soil occupied by soil pores
Water and soil total ideal % is 50%
True
Ideal soil water % is 25%
True
Ideal soil has 20 % air
false
25% is _________
Air
Which layer is the hardest layer.
 
Bedrock
 
Topsoil
 
subsoil
Which soil layers where plants have their roots?
Topsoil
It has many minerals in this layer of soil.
Subsoil
Can plants live without the water in the soil?
No
Can animals live in the soil?
Yes
minerals __________.
45%
organic matter is _________.
5%
______ is 25%
Water
It is made up of air, water, minerals and organic matter.
Soil
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