Distinguish between:

i. Erosion and weathering,

ii. Oxidation and carbonation,

iii. Sand dunes and Barchans.

i. Erosion:  erosion refers to the actions of exogenic processes which remove soil and rock from one location on the Earth's crust, then transport it to another location where it is deposited.
Weathering: Weathering is the breaking down of rocks, soil and minerals as well as artificial materials through contact with the Earth's atmosphere, biota and waters.
ii. Oxidation: Oxidation is the interaction between oxygen molecules and other substances. 
Carbonation: Carbonation or fizz is the process of dissolving carbon dioxide in a liquid. The process usually involves carbon dioxide under high pressure.
iii. Sand dunes: A sand dune is a mount, hill or ridge of sand that lies behind the part of the beach affected by tides. They are formed over many years when windblown sand is trapped by beach grass or other object .Sand dunes provide sand storage and supply for adjacent beaches.