It should be carbohydrates
I would say that the most likely environment for these two rock types to be ridge formers would be an arid climate like a desert where there was little water to dissolve. Also, even in a normal temperate environment, dolomite can form a very resistant ridge or cliff former as is the case with the Palliser Formation in Banff Park which forms a pronounced cliff which is very extensive.
Ok I think its small polar molecules but I could be wrong.
List of objects that float:
Ice
Wood
Rubber
Soda cans
Plastic toys (such as a duck)
Innertubes
Balloons
Frisbees
Legos
Plastic containers (Tupperware, etc.)
