The vegetation belt associated with valuable hard wood is the

A. Sahel Savanna

B. Tropical rainforest

C. Coniferous forest

D. Mediterranean forest

E. Moutane forest

Temperate grasslands are generally important for

A. mining

B. floating of logs

C. animal grazing

D. processing of meat and cheese

E. burning of grass for fuel

The greatest problem in the use of solar energy is

A. the high risk in its usage

B. its unreliability from day to day and season to season

C. the high intensity associatated with the sun

D. the high cost of transporting it for domestic use

E. its frequency of power failure

The sparse population in the Amazon Basin is best explained by the

A. very high tmperature all the year round

B. low range of temperature for agriculture

C. thick vegetation for settlements and agriculture

D. high relief and rugged terrain

E. high humidity and moist conditions

One danger about the present rate of increase in world population is

A. an improved standard of living

B. the fear of submergence of the earth

C. the high ratio of adults to children

D. decline in the supply of labour

E. an acute food shortage

A rapid population growth in a region can be caused by

A. more deaths than births

B. high emigration

C. the use of family planning methods

D. improved medical care

E. natural hazards