a gas made up of three molecules of oxygen (O3)
theory of slope development: as erosion takes place, the height and gradient of the slope...
a series of coordinates joined together to enclose an area
drops of water condensed on a cool surface, especially at night, from water vapour in the air...
a volcano that is not expected to ever erupt again
extraction of oil and gas resources that lie underwater by means of a well that has been drilled...
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