Which winds are caused either by topographic effects or by variations in surface composition?
A topographic profile is a plot showing the shape of the surface of the ground (so hills, hillocks, dips, valleys and the like). Whereas a geologic cross section shows the order and structure of soils and / or rocks below the ground surface. Geologic sections are typically created by first drawing a topographic profile of the section of interest then adding in the underlying strata. An example of the way they are created is given…
Yes, oil properties such as viscosity, density and compressibility are a function of pressure, temperature and composition. In an oil spill situation, the composition is changing due to evaporation of the light ends of the oil at the surface and weathering effects. If the oil comes into contact with dispersants, there's more compositional change.