WorksheetsSoil Chemistry
Total questions: 15
Worksheet time: 8mins
A thick, brown substance* that is filled with residue from decomposed animals and plants.
Loam
Compost
Humus
Feces
Read the passage about earthworms.
EARTHWORMS: Earthworms are very important for producing healthy, mature soil. Worms speed up humus
production by eating decaying material. In fact, worms are put into compost piles to help make natural fertilizer for crops. Worms leave holes and tracks in the soil that are
filled with water when it rains. Worms loosen
the top layer of soil making it ideal for thriving
plants.
How do earthworms help create organic material
for healthy soil?
Worms eat decaying material and break it into
smaller pieces.
Worms dry out the soil by drinking the water in
layers.
Worms break up rocks into smaller pieces.
Worms help with chemical weathering.
Which of the following are inorganic soil colloids ?
Aerosol agricultural sprays
Iron oxide
Clay
Humus
What does pH tell you about the soil?
How acidic the soil is.
The concentration of H ions in the soil
How cations will be exchanged in the soil.
All of the above
Soil acidity results from many sources. Select a natural process which can cause soil acidity.
The reaction of Carbon Dioxide and Water
Use of organic fertilizers
Nitrification of ammonium fertilizers
An inherently sandy soil
Which element causes soil to appear red?
calcium
iron
silicon
nickel
basic formula for a silicates
[ SiO4 ] 4-
[SiO3 ]
[ Si2O7 ]
What does pH measure?
the amount of hydrogen (H+) ions
the amount of hydroxide (OH-) ions
amount of water
all of the above
