Chap 16 multiple choice questions

Minerals are arranged in a regular, repeating pattern of _______. a. atoms b. aggregates c. metals d. evaporites

a. atoms

Which of the following is NOT one of the ways that ore minerals may form? a. flooding of empty stream beds and rivers b. cooling of magma c. circulation of hydrothermal solutions through rocks d. evaporation of water that contains salts

a. flooding empty stream beds

Which of the following is not an aggregate? a. sea glass b. sand c. gravel d. crushed rock

a. sea glass

From whom must mining companies obtain permits before mining a site? a. state and federal agencies b. federal agencies only c. local government only d. a bonding company

a. state and federal agencies (state and national governments)

Stream placers often occur a. in empty riverbeds b. at bends in rivers c. where rivers meet lakes d. where sediments are discharged

b. at bends in rivers

Gangue (pronounced GANG) minerals a. are valued for their rarity and durability b. have no commercial value c. are the most difficult to mine d. are native elements

b. have no commercial value (waste, worthless minerals)

Reclamation is the process of a. removing coal from a surface seam b. extracting ore minerals from gangue minerals c. returning land to its original or better condition after mining operations are completed d. protecting the habitats of local wildlife

c. Reclamation = reclaiming the land, restoring it to its previous state.

Crushed ore is melted to separate impurities from molten metal during ______ a. open-pit mining b. hydrothermal solution mining c. smelting d. dredging

c. smelting (hint: melted / smelted)

Which of the following is NOT one a method of subsurface mining? a. room-and-pillar mining b. longwall mining c. solution mining d. open-pit mining

d. open pit (open on SURFACE, not SUBsurface)

The process by which land sinks with little or no horizontal movement a. compounding b. quarrying c. reclamation d. subsidence

d. subsidence (hint: Subsidence = Sinking)