bog iron
Deposits of mixed oxides and hydroxides of iron formed when iron-bearing groundwater…Deposits of mixed oxides and hydroxides of iron formed when iron-bearing groundwater emerges onto the surface
Meaning
1 senses(uncountable)Deposits of mixed oxides and hydroxides of iron formed when iron-bearing groundwater emerges onto the surface
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable