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The biggest weakness for steel as a building material for ships would be rust from the water constantly touching the steel cold water temperatures can also make the steel brittle and weak so that is also counted as a major weakness as well.
The right present participle of the phrase "building of steel ships" is "building", this is correct. A better sentence is "Building of steel ships that are light and strong is important".
"Building of steel ships are light and strong" isn't a grammatically correct sentence. A better sentence is "The building of steel ships that are light and strong is crucial".
The participle of this sentence would be "The building of ships that are light and strong". Although this isn't strictly a grammatically correct sentence, the participle expression is building.
Steel has a couple weaknesses. Fire, fighting* and ground are the steels biggest weakness. And then there is the fact that many steel types have a secondary typing such as magneton witch is a dual steel and electric type so ground is 4x effective. *Keep in mind that all steel types have awesome physical defenses so fighting is only technically strong against steel.
grass :)
the strength is steel and the weakness is its weight
modern ships are welded, older ships use rivets to hold the steel together
Fire, fighting, rock and steel.
Steel hulled ships
Steel hulled ships
Ice, fighting, bug, and steel.