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251.

In which of the following is a knowledge of underlying rocks least essential:

A.	Road construction	B.	Oil drilling
C.	Soil analysis	D.	Weather studies

252.

Rocks differ from one another in these respects except:

A.	Salinity	B.	Texture
C.	Permeability	D.	Mode-pf occurrence

253.

A geyser is best described as:

A.	Pool of hot water	B.	An explosion Volanic Vapour
C.	A fountain of superheated steam	D.	A thermal stream

254.

In order to get a constant supply of water, wells have to be sunk to reach:

A.	The impervipusstrata	B.	Permanent water table
C.	Dry season water table	D.	Wet season water table

255.

Springs occur in the following areas except:

A.	Where a dyke or sill of impermeable rock intrudes through permeable rocks	B.	Along Fiords coasts where glaciers terminate
C.	Where permeable and impermeable rocks alternate in areas of tilted strata	D.	In limestone and chalk escarpments

256.

The most typical feature of a canyon is its:

A.	Large volume of water	B.	Muddy river banks
C.	Irregular slope surfaces	D.	U-shaped valley

257.

Loess is wind-blown dust. That is deposited outside the desert limits. It is also known by other names but not by the name:

A.	Serir	B.	Lunon
C.	Adobe	D.	Huangtu

258.

The most outstanding characteristic of arid desert is:

A.	The presence of waves of recessional morains	B.	Its vast expanse of barren sand
C.	Its small diurnal range of temperature	D.	Its high relative humidity

259.

The shape and size of sand dunes are influenced by the following except:

A.	The velocity of wind	B.	Relief of the ground
C.	The subterranean drainage pattern	D.	The size of the sand particles

260.

The ridge and furrow? Landscape of the hot deserts refers to that formed by:

A.	Mesas	B.	Inselbergs
C.	Barchans	D.	Zeugens