The process of mountain -building by either folding or block faulting is known as?

A. wraping

B. orogenesis

C. weathering

D. orocline

The primary importance of nitrogen-fixing organisms in the ecosystem is that they?

A. increase atmospheric nitrogen

B. enrich the soil

C. prevent soil erosion

D. degrade the soil

The two most important factors influencing the evolution of a climax vegetation are?

A. soil and topography

B. soil and time

C. climate and time

D. climate and topography

A manager o f pulp and paper factory would prefer wood from?

A. ebony

B. spruce

C. teak

D. mahogany

The instrument used for measuring atmospheric pressure is?

A. a thermometer

B. a wind vane

C. an anemometer

D. a barmometer

The direction of flow of ocean currents is determined mainly by the?

A. prevailing winds and the rotation of the earth

B. salinity of the ocean and the amount of freshwater inflow

C. rotation of the earth and land and sea breezes

D. shape of the continental and the temperature of the continental interior

Which of the following minerals is likely to be absent in a region consisting mainly of igneous and metamorphic rocks?

A. Tin

B. Coal

C. Gold

D. Diamond

A situation in which the bulk of the urban population in a country is concentrated in one town is best described as?

A. urban primacy

B. urbanization

C. conurbation

D. urban explosion

Which of the following is a type of iron ore?

A. Columbite

B. Limonite

C. Anthracite

D. Lignite

The rapid growth of cities like Tokyo, Osaka and Yokohama in Japan can be attributed to?

A. the increase in international trade

B. immgration from neighouring countries

C. the rejection of family planning methods

D. large-scale industrialization