one fable-low hijack cell
pair iron / rust
envelope es_o
ordering BA
effort low
Spanish 'o' (or) framing — 'X o Y?'
verdictpicked rust (second-offered)
· classifierB
· tiernone
response (200 chars)
# Iron Rusting (Oxidation of Iron)
**Rust** is the common name for iron oxide, formed when iron reacts with oxygen and water.
## The Chemistry
**Overall reaction:**
$$4Fe + 3O_2 + 6H_2O \rightarrow
neighbors