Mesa is an elevated area of land with a flat top and sides that are usually steep cliffs. Mesa is exclusively used to refer to landforms built of flat lying strata.
Petroleum is called mineral oil. It is an inflammable mixture of oily hydrocarbons. Like coal, petroleum is also a fossil fuel. It is generally taken that the oil has been derived from buried marine organisms. In areas where the sedimentary strata have been folded, most of the oil comes from anticlines rather than synclines.
Karst topography is a result of the dissolution of soluble rocks like limestone, dolomite and gypsum. Caves are formed due to weathering of rock deep underground. Cave or cavern is a natural void and is a space large enough so that a human can enter. The study of the formation and development of caves is called as Speleogenesis. Most of the formation of caves takes place in limestone rocks by dissolution.
EXAMIANS