1) How many people work in the secondary sector? a) 25% b) 20% c) 16% d) 10% e) 6% f) 23% 2) What type of mineral is the bauxite? a) Metallic b) Non-metallic c) Energy d) Precious 3) What is cobalt used to? a) Create batteries b) Store energy in less space c) To make batteries longer 4) Why we can't use graphene nowadays? a) Because we can't make it in large quantities b) Because we don't have resources c) Because we can't found carbon attoms. 5) How do we obtain nuclear energy nowadays? a) Through fusion b) Through fission c) By using coal d) By using radioactive wastes 6) Which renewable energies are the most developed? a) Geothermal and nuclear b) Tidal and nuclear c) Wind and biomass d) Coal and solar e) Petrol and nuclear f) Wind and solar 7) What energy sources were used first? a) Petrol and oil b) Gas and coal c) Wind and solar d) Coal and hydrological 8) What is NOT a threat to the environent? a) Air pollution b) Deforestation c) Use of electricity d) Erosion e) Endangered species f) Water pollution

Secondary Sector

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