The soil on the earth should be safeguarded without any eruption.this is very important to maintain.the composition of the soil is
MINERAL MATTER --------------45%
ORGANIC MATTER----------------5%
SOIL WATER------------------------25%
SOIL AIR------------------------------25%
THIS COMPOSITION SHOLD BE MAINTAINED WELL TO GET THE GOOD EFFECT FROM THE SOIL.
Soil pollution will come from the sources like
Urban waste
Biological agent
Agricultural practices