An important mineral deposit in south Africa which has attracted a large number of white settler is
Iron in Durban
Copper in Cape Town
Gold in Witwatersrand
Aluminium in Johannessburg
Correct answer is D
Africa leads the whole world in the production of gold. South Africa is the largest producer of gold.
___________ is a layer of very fine wind-deposited sand and silt?
loess
seif
barchan
bajada
Correct answer is A
Loess are loose, fine particles which are carried by wind and deposited outside the desert. Deposits of loess are found in North-West China
flood plain
cuesta
watershed
plateau
Correct answer is C
A Watershed is a highland area which seperates the headstreams of rivers flowing in different directions but rising from the same mountainous source
Which of the following is a way of controlling soil erosion
Overgrazing
Contour ploughing
Deforestation
Bush burning
Correct answer is B
Contour ploughing is the making of ridges across the slope to control erosion
The soil gains nitrogen through one of the following except
Denitrification
Application of organic manure
Electrical discharge
Symbiotic nitrogen fixation
Correct answer is A
Denitrification is the major way by which nitrate in the soil is lost by its conversion to gaseous nitrogen with the aid of some denitrifying bacteria