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Iron ore: Quiz


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Question 1: Occasionally ________ and ultrapotassic igneous rocks segregate magnetite crystals and form masses of magnetite suitable for economic concentration.

Question 2: The world's largest producer of iron ore is the Brazilian mining corporation Vale, followed by Anglo-Australian companies ________ and Rio Tinto Group.
National Australia BankNews CorporationBHP BillitonWestpac

Question 3: Small amounts of ________ (Al) are present in many ores (often as clay) and some limestone.

Question 4: ________ (P) has four major effects on iron: increased hardness and strength, lower solidus temperature, increased fluidity, and cold shortness.

Question 5: The total recoverable reserves of iron ore in ________ are about 9,602 million tones of hematite and 3,408 million tones of magnetite.
IndiaIndia and the Non-Aligned MovementLok SabhaResearch and Analysis Wing

Question 6: Banded iron formations (BIF) are metamorphosed sedimentary rocks composed predominantly of thinly bedded iron minerals and silica (as ________).

Question 7: Metallic iron is virtually unknown on the surface of the Earth except as iron-nickel alloys from ________ and very rare forms of deep mantle xenoliths.
Impact craterMeteoriteImpact eventMeteoroid

Question 8: Iron ores consists of ________ and iron atoms bonded together into molecules.

Question 9: ________ iron ore deposits are currently exploited on all continents, with the largest intensity in South America, Australia and Asia.

Question 10: A few iron ore deposits, notably in ________, are formed from volcanic flows containing significant accumulations of magnetite phenocrysts.


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