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Earlier discussion
2 older comments kept for context.
isaac alamu
soil is the upper most layer of the earth crust which support plants growth,soil texture is the relative proportion(sizes) of different soil particles,soil structure is ways and manners in which soil particle are arranged or packed,soil ph is the degree of alkalinity and soil acidity,now to the question SOIL PROFILE:is the vertical section of the soil which show horizontal layers of different soil horizon,A,B,C,D,horizon A is the top soil constist of organic particle and it's also the horizon that has the most living organisms,horizon B is the sub soil,C is the parent material,and D is the bed rock
Doctor Strange
The topsoil is the region with the most biological activity. Many organisms live within this layer. Plant roots stretch down into this layer. The roots help to hold the topsoil in place.
A - horizon is the top layer of the soil horizon, it contains decomposed organic matter which is necessary for plant growth and also microorganisms