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Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.ther forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen â rebar used in underwater concrete pillars is an example â which generates green rust.
Why You Canât Just Repair Cracks Caused by a Dropped or Settled Foundation. The most common cause of a foundation dropping or âsettlingâ is that the soil that has been supporting it has shrunken or become compacted, usually because the moisture that had been contained in that soil has been drawn off by drought or other causes.