Soil is the foundation of life on land. From the soil grow the plants that feed us and fill our atmosphere with oxygen. It stores nutrients that it passes along to us through the food chain.

The iron and aluminium oxides collect in the 'B' horizon where the iron oxides can accumulate to form a thin layer of hardpan, which impedes drainage through the soil. Illuviation is the process ...

Soil and water are essential natural resources ... The most prevalent clay-sized particles in soils fall into the class of layer-type aluminosilicates (Sposito 2008) that commonly have permanent ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about ...

As the layer of fertile topsoil thins, it gets increasingly difficult to grow crops for food. Without altering agricultural practices and urgently finding ways to preserve soil, the global food ...

This design option is only practical if the average water table level is several feet below the bottom of the filter, and the surrounding soil is permeable enough to allow the water to leave the area ...