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Soil formation begins with the weathering of
the A horizon
Soil that is rich in humus has high
When earthworms add their wastes to the soil, then die and decay in the soil, they are contributing to the formation of
Living organisms in soil help to
slow the rate of soil formation.
build up the C horizon.
mix the soil and make humus.
Decomposers are the soil organisms that
store moisture in the soil.
break down and digest the remains of dead organisms.
make spaces in the soil for air and water.
Soil is a valuable resource because it
is important to all living things on land.
contains sand and gravel.
is rich in decomposers.
What can cause the loss of soil that is not protected by plant cover?
erosion by water or wind
Most of the work of mixing humus within the soil is done by
A permeable rock weathers easily because it
is made up of small particles.
contains many small, connected airspaces.
is made up of only one mineral.
In which soil layer would you find loam that is rich in humus
The texture, or particle size, of soil determines
whether the soil is topsoil or subsoil.
how much air and water the soil can hold.
The type of soil called loam is made up of
nearly equal amounts of silt, sand, and clay.
In a cross section of soil, the B horizon consists of
clay, minerals, and little humus.
partly weathered rock.