We store sodium and potassium in kerosene because they are highly reactive metals , and produces fires when they react with water or air.
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horizons of the soil
soil consists of the following horizons:
1. horizon a or topsoil
it is also called the humus layer, is rich in organic material. layer consists of decomposed material and organic matter. is the reason, the topsoil has a dark brown color. the hummus makes the topsoil soft, porous to hold enough air and water. in layer, the seeds germinate and roots of the plants grow. many living organisms like earthworms, millipedes, and centipedes, bacteria, and fungi are found in layer of soil.
what are the different properties of soil?
2. horizon b or subsoil
just below the topsoil lies another layer called subsoil or horizon-b. it is comparatively harder and compact than topsoil. it is lighter in color than the topsoil because there is less humus in layer. layer is less organic but is rich in minerals brought down from the topsoil. it contains metal salts, especially iron oxide in a large proportion. farmers often mix horizon-a and horizon-b when their fields.
what is soil erosion?
3. bedrock or horizon c
bedrock is also known as parent rock and lies just below the subsoil. it contains no organic matter and made up of stones and rocks, so it is very hard. layer represents a transition zone between the earth’s bedrock and horizon a and b.