the best material is wood or metal or clay
If you are talking about a cargo ship then the cargo is kept right on the deck of the boat.
Any material that will float, such as wood or plastic.
it is the cargo area. in a boat? ya know, dude.
It will vary on the engine of the boat. Including the cargo. How heavy the cargo is.
barge
cargo
A hold is a large vacant space below decks where the cargo is put in a boat.
a cargo boat or a cargo plane either one is correct if you have a test
Make a Submarine
I don't understand what you're asking, so I'll reply based on the literal meaning of your question. One way to change the overall density of a boat is to take it apart and make it out of a material with a different density. You could just add ballast or cargo.
inside, on the bottom. the place where they put cargo
Mainly local heavy cargo.