Science (4th) Ch. 6 Lesson 2 - Soil (vocab & notes)
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Decayed plant and animal matter in soil.
humus
A layer of soil that is different from the layers above it and below it.
horizon
A view of the different horizons in a soil, from the surface down to the bedrock.
soil profile
The dark top layer of soil, rich in humus and minerals, in which many organisms live and grow.
topsoil
A hard layer of clay and minerals beneath topsoil.
subsoil
The space between particles of soil.
pore space
Having pore spaces through which air and water can pass.
porous
The measure of how fast water can pass through a porous material.
permeability
What type of soil is rich in humus and minerals and it is home to many living things?
topsoil
The rate at which water passes through soil is called ___________.
permeability
True or False Soil is formed by weathering occurring over thousands of years and rocks breaking down into smaller pieces.
True
Which layer of soil is where you find plant roots and other living things?
topsoil