The phrase "active sand" is correct and usable in written English.
It can be used in contexts related to geology, environmental science, or engineering, often referring to sand that is in motion or being actively shaped by natural forces.
Example: "The coastal erosion was exacerbated by the presence of active sand, which shifted with the tides and wind."
Alternatives: "mobile sand" or "dynamic sand".
However, the differences between the two landscapes should become clear once Curiosity makes some closer inspections - it's currently examining dunes in the Bagnold field, giving scientists and geologists the first-ever close look at active sand dunes on another planet than the Earth.
The Gibson Desert consists in large part of a laterite-capped plain, but huge areas of the plains of central and northern Australia are occupied by active sand dunes, and large areas of southern South Australia and Western Australia are covered by fields of fixed dunes.
However, there are three active sand quarries in the vicinity and various exposures in incised gullies.
Sticky traps were also used for sampling indoor active sand flies.
Evidence of active sand transport often takes the form of well-expressed sand ripples on a dune's surface.
Low rainfall and high-potential evaporation result in sparse or nonexistence vegetation and as a consequence active sand dunes (Thornthwaite 1931).
Three stages of soil development corresponding to specific landscapes were observed within a 2-m deep profile: 1) a stabilisation surface within an active drift sand landscape, 2) an A-horizon that developed on a stabilised drift sand landscape and 3) a pronounced podzol that developed in a stabilised landscape from the last glacial.
Accordingly, we recommend the use of this product every 2 3 weeks during the active phlebotomine sand fly period to protect dogs against the bites of P. perniciosus.
However, due to change in land-use, their limited size, eutrophication and colonisation by invasive exotics, the area occupied by active drift sand is rapidly declining and with it its unique fauna and vegetation.
The main body is characterized by the combination of distributary channels and three active river-mouth sand bars, which are elongated and extend southeastward (Li et al. 2002).
The region is divided into four geomorphic provinces: desert with active dunes and sand seas; desert pediment with fans; and foothills with deep gorges and glaciated mountains.
