Diamonds 4-6
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| show | D. 90 to 120 miles (140 to 190 km)
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| The deep vertical formations through which diamonds traveled to the surface are called A. drifts. B. pipes. C. cratons. D. alluvials. | show 🗑
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| The first authenticated diamond discovered in South Africa is named the A. Eureka. B. Cullinan. C. De Beers. D. Star of Africa. | show 🗑
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| Most of the world’s kimberlite pipes A. are located close to large cities. B. are being mined for diamonds at the present. C. do not contain diamonds in profitable quantities. D. are believed to contain great quantities of diamonds. | show 🗑
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| show | A. cratons.
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| Scientists have found that diamonds form in two types of rocks, called A. marble and shale. B. sandstone and schist. C. peridotite and eclogite. D. kimberlite and lamproite. | show 🗑
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| show | A. carbon.
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| show | D. the way their atoms fit together.
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| show | C. the availability of carbon.
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| Subduction occurs when A. volcanoes erupt. B. mountains collide. C. tidal waves sweep over landmasses. D. two of the earth’s crustal plates collide. | show 🗑
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| Diamonds were delivered to the earth’s surface as recently as A. 20 billion years ago. B. 20 million years ago. C. 1 million years ago. D. 10,000 years ago. | show 🗑
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| show | A. core.
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| Before arriving at the earth’s surface, diamonds might remain in the mantle for as long as a few A. days. B. hours. C. hundred years. D. hundred million years. | show 🗑
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| show | D. convert to graphite.
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| Diamond deposits found at the ocean’s shore are A. marine deposits. B. primary deposits. C. industrial deposits. D. shoreline deposits. | show 🗑
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| For more than 2,000 years, the only known diamond sources were A. alluvial. B. primary. C. kimberlite pipes. D. ancient volcanic craters. | show 🗑
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| Diamonds are more concentrated in A. marine deposits. B. primary deposits. C. volcanic deposits. D. mountain deposits. | show 🗑
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| Only a small percentage of known diamond deposits are mined because most A. are not profitable. B. are too close to populated areas. C. are too far from populated areas. D. require expensive government permits. | show 🗑
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| show | A. its ore grade.
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| Most of the diamonds mined today come from A. pipes. B. beaches. C. riverbeds. D. the ocean floor. | show 🗑
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| show | C. industrial diamonds.
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| show | D. diamonds.
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| show | C. look for the oldest parts of the earth’s crust.
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| show | B. lighter materials.
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| show | B. industrial quality.
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| To focus their search for diamond deposits, geologists look for A. river gravels. B. trace elements. C. indicator minerals. D. small grains of graphite. | show 🗑
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| show | A. cuttable.
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| show | D. produces diamonds whose value is higher than the mine’s operating costs.
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| show | B. ore grade.
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| Shortly before the discovery of the South African deposits, the world’s major diamond producer was A. India. B. Brazil. C. Russia. D. Canada. | show 🗑
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| Most diamonds from Australia are A. large, but of poor color. B. large and near-colorless. C. small and poor in quality. D. small, but of good quality. | show 🗑
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| show | A. Siberia.
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| African diamonds are recovered from A. pipe deposits only. B. alluvial deposits only. C. pipe and alluvial deposits. D. pipe, alluvial, and marine deposits. | show 🗑
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| The largest percentage of world diamond production (by weight) is mined in A. Brazil. B. Angola. C. Australia. D. Indonesia. | show 🗑
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| show | A. mining diamond pipes.
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| show | A. separating diamond from ore gravels.
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| show | C. large in scale and extremely expensive.
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| A horizontal tunnel drilled through a diamond pipe is called a A. path. B. drift. C. shaft. D. channel | show 🗑
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| show | C. scrubbers.
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| show | B. open-pit mining.
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| show | D. diamonds sink to the bottom of a mix of gravels.
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| show | A. pink.
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| The shift in emphasis from alluvial to primary diamond mining was due to A. improved technology. B. environmental concerns. C. depletion of secondary sources. D. political and governmental pressures. | show 🗑
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| Russia’s diamond sources are almost all A. alluvial. B. primary. C. depleted. D. secondary. | show 🗑
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Created by:
vera caniglia