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Online Quiz (Worksheet A B C D)

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Upper Elementary Science - II
3.15 Soil

Soil type usually refers to the different sizes of mineral particles in a particular sample. There are twelve types of soil. The kind of soil in an area helps determines what type of plants can grow. Alfisols, Aridisols, Entisols, Histosols, Inceptisols, Mollisols, Oxisols, Spodosols, Ultisols, Gelisols, Andisols, and Vertisols are the soil types. A scientist who studies soil is called a pedologist.

Soil Formation: Soil is formed by the break up of rocks by natural agents such as wind, water, and other natural phenomena. There are many layers of soil invariably associated with varying organic matter and fertility.

Soil Layers:

Top Soil: The top, organic layer of soil, made up mostly of leaf litter and humus (decomposed organic matter). This is the fertile layer of the soil.

Sub-soil: It contains clay and mineral deposits (like iron, aluminum oxides, and calcium carbonate) that it receives from layers above it when mineralized water drips from the soil above.

Regolith: Plant roots do not penetrate into this layer; very little organic material is found in this layer.

Rock-bed: The unweathered rock (bedrock) layer that is beneath all the other layers.


Directions: Answer the following questions.
Q 1: A scientist who studies soil is called
soilogist
pedologist
paleontologist
geologist

Q 2: Clay is found in the layer of
sub-soil
regolith
rocky bed

Q 3: The layer below the top soil is
regolith
rock-bed
sub-soil

Q 4: Regolith is a layer just above the
rock bed
sub soil
top soil

Question 5: This question is available to subscribers only!

Question 6: This question is available to subscribers only!


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