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Nodule (geology): Quiz

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Question 1: Nodules are typically solid replacement bodies of ________ or iron oxides formed during diagenesis of a sedimentary rock.
AgateChertOpalFlint

Question 2: There is an important distinction to draw between nodules and ________; the latter being formed from mineral precipitation around some kind of nucleus while the former is a replacement body.
Sedimentary rockConcretionSandstoneMoeraki Boulders

Question 3: ________ and flint nodules are commonly found in horizontal layer in limestone and chalk formations respectively.
AgateOpalChertQuartz

Question 4: They form from the recrystallisation of ________ silica arising from different marine organisms after their death: siliceous spicules of sponges, or debris from radiolaria.
Amorphous solidSolidGlass transitionGlass

Question 5: ________ are rounded accumulations of manganese, iron and other metal oxides that accumulate on the deep ocean floor.
TodorokiteManganese noduleEudialyteSugilite

Question 6: Nodules may be hollow as geodes or vugs or filled with crystals and intricate geometric shrinkage patterns as in ________.
SandstoneConcretionMoeraki BouldersSedimentary rock

Question 7: ________, formed from mineral precipitation in the pores of a sediment, not to be confused with nodules
Moeraki BouldersConcretionSedimentary rockSandstone

Question 8: A nodule in petrology or ________ is a secondary structure, generally spherical or irregularly rounded in shape.
GoldSulfurMaterials scienceMineralogy

Question 9: ________ are also a widespread source of biogenic silica in marine sediments.
EustigmatophyteCoscinodiscophyceaeDiatomRaphidophyte







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