The banded iron formations stopped forming due to option D - The free iron in the ocean became scarce.

Here's a step-by-step explanation:

1. Banded iron formations are sedimentary deposits of iron and silica that were primarily deposited during the Precambrian era when the atmosphere was oxygen-poor.

2. As photosynthetic organisms (like cyanobacteria) evolved, they began to produce oxygen through photosynthesis.

3. This oxygen reacted with the iron dissolved in the ocean, forming iron oxide compounds that precipitated out of the water, falling to the ocean floor and creating the banded iron formations.

4. Over time, the amount of free iron in the ocean decreased as it was all converted into iron oxide and deposited as banded iron formations.

5. Eventually, the free iron in the ocean became scarce, and thus the banded iron formations stopped forming.

So, the cessation of banded iron formation is linked to the depletion of free iron in the ocean, not the development of Earth's magnetic field, the formation of chert, or the depletion of free oxygen in the oceans.

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The banded iron formations stopped forming due to option D - The free iron in the ocean became scarce.

Here's a step-by-step explanation:

1. Banded iron formations are sedimentary deposits of iron and silica that were primarily deposited during the Precambrian era when the atmosphere was oxygen-poor.

2. As photosynthetic organisms (like cyanobacteria) evolved, they began to produce oxygen through photosynthesis.

3. This oxygen reacted with the iron dissolved in the ocean, forming iron oxide compounds that precipitated out of the water, falling to the ocean floor and creating the banded iron formations.

4. Over time, the amount of free iron in the ocean decreased as it was all converted into iron oxide and deposited as banded iron formations.

5. Eventually, the free iron in the ocean became scarce, and thus the banded iron formations stopped forming.

So, the cessation of banded iron formation is linked to the depletion of free iron in the ocean, not the development of Earth's magnetic field, the formation of chert, or the depletion of free oxygen in the oceans.

Knowee AI · Accepted Answer

The banded iron formations stopped forming due to option D - The free iron in the ocean became scarce.

Here's a step-by-step explanation:

1. Banded iron formations are sedimentary deposits of iron and silica that were primarily deposited during the Precambrian era when the atmosphere was oxygen-poor.

2. As photosynthetic organisms (like cyanobacteria) evolved, they began to produce oxygen through photosynthesis.

3. This oxygen reacted with the iron dissolved in the ocean, forming iron oxide compounds that precipitated out of the water, falling to the ocean floor and creating the banded iron formations.

4. Over time, the amount of free iron in the ocean decreased as it was all converted into iron oxide and deposited as banded iron formations.

5. Eventually, the free iron in the ocean became scarce, and thus the banded iron formations stopped forming.

So, the cessation of banded iron formation is linked to the depletion of free iron in the ocean, not the development of Earth's magnetic field, the formation of chert, or the depletion of free oxygen in the oceans.

Why did the banded iron formations stop forming? LO.11 A- The development of earth's magnetic field B- Chert stopped forming in the oceans C- The free oxygen in the oceans was depleted D- The free iron in the ocean become scarce

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