Banded iron formations indicate that free oxygen in the atmosphere increased. So, the best answer is A- Free oxygen in the atmosphere increased.

Here's why: Banded iron formations are sedimentary deposits of iron and silica that are often found in distinct bands. They were formed approximately 3.8 to 1.8 billion years ago, during the Archean and Proterozoic Eons. The formation of these bands is linked to the increase in atmospheric oxygen, a period known as the Great Oxygenation Event. As oxygen began to accumulate in the atmosphere due to photosynthetic cyanobacteria, it reacted with iron in the ocean, forming iron oxides that precipitated out of the water and sank to the ocean floor, creating the banded iron formations.

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Banded iron formations indicate that free oxygen in the atmosphere increased. So, the best answer is A- Free oxygen in the atmosphere increased.

Here's why: Banded iron formations are sedimentary deposits of iron and silica that are often found in distinct bands. They were formed approximately 3.8 to 1.8 billion years ago, during the Archean and Proterozoic Eons. The formation of these bands is linked to the increase in atmospheric oxygen, a period known as the Great Oxygenation Event. As oxygen began to accumulate in the atmosphere due to photosynthetic cyanobacteria, it reacted with iron in the ocean, forming iron oxides that precipitated out of the water and sank to the ocean floor, creating the banded iron formations.

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Banded iron formations indicate that free oxygen in the atmosphere increased. So, the best answer is A- Free oxygen in the atmosphere increased.

Here's why: Banded iron formations are sedimentary deposits of iron and silica that are often found in distinct bands. They were formed approximately 3.8 to 1.8 billion years ago, during the Archean and Proterozoic Eons. The formation of these bands is linked to the increase in atmospheric oxygen, a period known as the Great Oxygenation Event. As oxygen began to accumulate in the atmosphere due to photosynthetic cyanobacteria, it reacted with iron in the ocean, forming iron oxides that precipitated out of the water and sank to the ocean floor, creating the banded iron formations.

Which answer best describes what banded iron formation indicate? LO.11 A- Free oxygen in the atmosphere increased B- The PH of earth's oceans was once lower than today C- Iron is a major component of earth's crust D- Chert can only form alongside iron oxide minerals

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