What is the upper most layer of soil?
multipleQAs
What is the upper most layer of soil called? What is the upper most layer of soil composed of?
very top layer "O Horizon or A Horizon," Topsoil
mineral particles, organic matter, water, and air
Topsoil
upper most layer of soil
Topsoil Soil horizon Hardpan Soil erosion Lithosphere Benthic zone Gelisol Sial Soil Biological soil crust
Topsoil is the <b>upper</b>, outermost <b>layer of soil</b>, usually the top 5 inches (13 cm) to 10 
inches (25 cm). It has the highest concentration of organic matter and 
microorganisms and is where <b>most</b> of the Earth&#39;s biological <b>soil</b> activity occurs&nbsp;... A <b>soil</b> horizon is a <b>layer</b> parallel to the <b>soil</b> surface, also the decaying matter on it (
plant litter), ... <b>Many soils</b> have an organic surface <b>layer</b>, which is denominated 
with a capital letter (different letters, depending from the system). The mineral ... O
) Organic surface <b>layer</b>: Litter <b>layer</b> of plant residues, the <b>upper</b> part often 
relatively&nbsp;... In <b>soil</b> science, agriculture and gardening, hardpan or <b>soil</b> pan is a dense <b>layer of</b> 
<b>soil</b>, usually found below the <b>uppermost</b> topsoil <b>layer</b>. There are different types&nbsp;... <b>Soil</b> erosion is the displacement of the <b>upper layer of soil</b>, it is one form of <b>soil</b> 
degradation. ... Silty <b>soils</b> tend to be the <b>most</b> affected by wind erosion; silt 
particles are relatively easily detached and carried away. Wind erosion is much 
more&nbsp;... Earth&#39;s lithosphere includes the crust and the <b>uppermost</b> mantle, which constitute 
the hard and rigid outer <b>layer</b> of the Earth. The lithosphere is subdivided into&nbsp;... The benthic zone is the ecological region at the lowest level of a body of water 
such as an ocean, lake, or stream, including the sediment surface and some sub-
surface <b>layers</b>. ... Examples of contact <b>soil layers</b> include sand bottoms, rocky 
outcrops, coral, and bay mud. ... <b>Many</b> have adapted to live on the substrate (
bottom). Gelisols are an order in USDA <b>soil</b> taxonomy. They are <b>soils</b> of very cold climates 
which are ... Because <b>soil</b> organic matter accumulates in the <b>upper layer</b>, <b>most</b> 
Gelisols are black or dark brown in <b>soil</b> color, followed by a shallow mineral <b>layer</b>. In geology, the term &#39;sial&#39; refers to the composition of the <b>upper layer</b> of the Earth&#39;s 
crust, ... The <b>uppermost layer</b> of the crust is called sial consisting of silicate and 
Aluminium (Si =silicate, Al= aluminium). On an average, the thickness of sial is till
&nbsp;... <b>Soil</b> is a mixture of organic matter, minerals, gases, liquids, and organisms that 
together support ... <b>Most soils</b> have a dry bulk density (density of <b>soil</b> taking into 
account voids when dry) ... Surplus water percolating through the <b>soil</b> profile 
transports soluble and suspended materials from the <b>upper layers</b> (eluviation) to 
the&nbsp;... Biological <b>soil</b> crusts are communities of living organisms on the <b>soil</b> surface in 
arid and ... These filaments bind <b>soil</b> particles throughout the <b>uppermost soil</b> 
<b>layers</b>, forming a 3-D net-like structure that holds the <b>soil</b> together in a crust.
Topsoil
Topsoil