Natural surface changes include erosion and sedimentation but also changes in dune systems and lava flows.
Natural surfaces
Sedimentation
The settling of particles into sediment that were once suspended in water. Remains non-vegetated (level 1). Level 3: From NW (P1) to NS (P2).
Erosion
The slow breaking down of material through wind, water or ice that is then transported. Remains non-vegetated (level 1). Level 3: From NS (P1) to NS (P2).
Salinisation
The process of becoming more salty; the accumulation of soluble salts (e.g. sodium chloride) in soil. Many Australian soils and landscapes contain naturally high levels of sodium salts held deep in the soil profile. Remains non-vegetated (level 1). Level 3: From NS or AS (P1) to NS (P2). Time period: months to years.
Desertification
The most common form of desertification is loss of perennial grasses from grasslands, savannas, and open woodlands, often with a replacement by inedible shrubs. Desertification continues to be a problem, especially during droughts when grazing pressures reduce ground cover, laying bare landscapes to wind and water erosion. Moves from vegetated to non-vegetated land (level 1).…
Deposition
A geological process in which sediments, soil and rocks are added to a landform or land mass. Remains non-vegetated (level 1). Level 3: From NS (P1) to NS (P2).