Gravel - small water-worn or pounded stones, Sand - a loose granular substance, smaller than gravel, Deposition - the laying down of sediment carried by wind, flowing water, the sea or ice, Particle - A very small piece of solid matter, Subsoil - Rich in minerals, such as iron and aluminum compounds, that were washed down from other soil horizons. , Topsoil - has fertilizer for plants, such as humus and nitrogen compounds. , Organic  - part of soil is made of living things, dead things, and waste from living things., Inorganic  - part of soil is mostly made of pieces of rocks., Clay - a soil that contains a mostly fine particles that water cannot pass through, Sediment  - matter that settles to the bottom of a liquid,

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