For this topic, you will do the topics from the attached list and construct two

Question

For this topic, you will do the topics from the attached list and construct two one-page concept sketches. Remember that a concept sketch consists of a sketch (or series of sketches), labels, and complete sentences written around the sketch describing the important processes or parts of the sketch.

For this topic, select a resource topic from the attached list and construct a concept sketch. Remember that a concept sketch consists of a sketch (or series of sketches), labels, and complete sentences written around the sketch describing the important processes or parts of the sketch.

Attached list: Precambrian banded iron formations: Great Lakes region of Canada, Minnesota, and Michigan, and western Australia.

(You can use Wikipedia or any book resources)

Explanation / Answer

Answer:

The iron formation of the region are about 2000 million years old, when oxygen got accumulated into sea water and reacted with dissolved iron of sea to made it precipitated. Iron in the form of hematite, limonite and siderite are present. The all given places having iron formation in the form of banding, representing variation of iron content and colour. And these were the product of excessive oxygen supply in the sea or lake water in precambrian time which reacted with present iron content to made it concentrated in the form of layers.

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