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Placer deposit: Quiz


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Question 1: Placer environments typically contain black sand, a conspicuous shiny black mixture of iron oxides, mostly magnetite with variable amounts of ilmenite and ________.

Question 2: Placer materials must be both dense and resistant to ________ processes.
Calcium carbonateMineralWeatheringOxygen

Question 3: ________
IlmeniteMagnetiteHeavy mineral sands ore depositsBauxite

Question 4: Exceptionally dense substances such as ________ and the platinum group members will accumulate in placers, when they are present.

Question 5: In ________, a placer deposit or placer is an accumulation of valuable minerals formed by deposition of dense mineral phases in a trap site.
NatureEarthEarth scienceGeology


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