you know rubberized materials that inflict pleasure
Fibre glass is a good material to make boats it is a mixture of glass and plastic.
If boats didn't float, they wouldn't be boats, they'd be anchors.
The people or cargo that they carry.
Oxygen.
You can't make a bar of metal float on water, but boats with metal hulls float. Also, metal bars and other metal objects float on mercury.
To make boats float
Boats can sink. They are usually made of materials that allow them to displace water, and permit them to float. From time to time, that material will break down, and the boat will sink.
Fast speed boats are made of materials that are used to make fast speed boats.
They float.
Science is what can explain how boats float and work.
Yes, if it makes the water denser, the boat will float easier. For example, it is easier to float in salty water.
Bouyancy is what makes a boat float