Banded Iron Formations and Rust Formation

What is the primary cause of rust formation on an iron nail placed in water?

• Reaction with oxygen dissolved in water

• Reaction with hydrogen in water

• Reaction with carbon dioxide in water

• Reaction with nitrogen in water

Tags

NGSS.MS-PS1-5

What are banded iron formations?

• Sedimentary rock layers with alternating rusted and nonrusted layers

• Layers of consistently rusted rocks on land

• Sedimentary rock layers with only rusted layers

• Layers of rocks formed by volcanic activity

Tags

NGSS.MS-ESS3-1

Why did iron remain in solution in the early oceans before photosynthetic organisms existed?

• There was no oxygen to combine with the iron

• The water temperature was too high

• The iron was in a different chemical form

• The ocean currents prevented rust formation

What do red beds indicate about the Earth's atmosphere?

• Significant atmospheric oxygen was present

• Lack of oxygen in the atmosphere

• Presence of volcanic activity

• High levels of carbon dioxide

Where can some of the best examples of banded iron formations be found?

• Western Australia

• Eastern United States

• Northern Europe

• Southern Africa