Its average density is a lot less than water
Yes (if you haven't burst all the bubbles).
The surface area of the raft displaces the water forcefully which causes float
A cork has a low density. It is lower then water. That causes it to float.
The density of the bubble is lower.
yes
What causes it to sink or float is the density. The density of water is 1.0. If the object's density is more 1.0 then it sinks, but if the object's density is less then 1.0 then the object will float.
The density of ice is lower than the density of water.
Ice has a lower density than water.
Air bubbles in the water....
The gas inside the bubble is less dense than the surrounding water
Pine cones float because they are less dense than the water, so they float. When you put them in right-side-up, the air gets trapped under the water. This causes the air bubbles to push up which makes the pine cone float.
Yes, Glinda the Good floats around in a bubble :D