Classic sedimentary rocks are made up of pieces of per-existing rocks. Pieces of rock are loosened by weathering, and then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock. The process by which sediment is laid down in new locations is deposition. A river delta is an example of deposition. Areas with a high degree of deposition are often agriculturally fertile.

Rocks are weathered by mechanical physical forces chemical forces and biochemical forcess.

In areas of water the action of water is very important but wind and temperature is also related.

The chemical force might be seen as ability of acids to dissolve the rock and the chemical effect is magnified by living biochemistry.

A good example is the ability of lichens which is an association of algae and fungi to anchor to rocks and secrete organic acids which allow solubilization of the rock substrate.

A bioengineering of the soil development process can even be employed to to capture carbon and nitrogen from the air and incorporating them in stabilized organic matter.

The naked clay minerals or organic matter are both anionic in their overall charge and in that state disperse and easily lost into solution.

The aggregation of loose clay and organic matter can be aggregated and precipitated by having cationic materials in solution.

The complex of clay organic matter mediated through cationic bridges allows a persistent of organic matter without its easy loss allowing soil organic matter to accumulate in the soil rather as a greenhouse gas.

Beside the lowering of the emissions of GHG the natural sequestration of carbon and nitrogen can be a final solution of the AGW issue. This is important because the vast majority of world soils are not optimized for carbon or nitrogen and organic matter can ameliorate water deficit while also providing optimized nutrion of our food plants our planet depends.

Dr Paul Reed Hepperly thank you for your contribution to the discussion

Weathering is the breaking down or dissolving of rocks and minerals on Earth’s surface. Once a rock has been broken down, a process of erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. Another name for sediment transport is sediment load. The total load includes all particles moving as bed load, suspended load, and wash load. Bed load transport is a process by which sediment particles on the bed of a river or stream are moved by the flow of water. In this process, larger sediment particles, such as gravel and sand, are picked up by the force of the water and roll, slide, or bounce along the bottom of the stream channel.The combined effects of sediment transport within the surf zone by the long shore current and sediment movement along the beach by swash and backwash is known as long shore transport, or littoral drift. Sedimentary rocks can be organized into two categories. The first is detritus rock, which comes from the erosion and accumulation of rock fragments, sediment, or other materials categorized in total as detritus, or debris. The other is chemical rock, produced from the dissolution and precipitation of minerals. f sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock. These rocks often have distinctive layering or bedding and create many of the picturesque views of the desert southwest. Sedimentary rocks are classified into three groups: Classic, Biologic, and Chemical. Sedimentary rocks are formed by the weathering, erosion, deposition, and nitrification of sediments. Basically, sedimentary rocks are composed of the broken pieces of other rocks.