floating on the water and the direction is directed by the wind :P
The water density is higher than the boat's therefore it floats on the water.
Torpedoes did the damage; under-water damage, the worst kind of damage for anything floating on water.
To skim over water means to remove the floating matter over the water.
no
upthrust
Yes, radio controlled boats do work on the water. In fact there are some boats that can reach over 140mph. The radio controlled boats are engineered to work great on water.
huge floating logs
Boats
As the river is over 4,000 miles long the only answer is that in parts it is polluted. Pollution is caused numerous ways and there are calls for more control over industry, new construction and the use of the river by watercraft, especially to dispose of their waste - including floating houses and the river commercial fleet comprised of more than 3000 boats. Around 200 cruisers, 500 boats for passengers, 1600 boats for carrying commodities and 300 motor boats, in addition to 400 floating hotels. The links below addresses just one aspect of construction and a paper on pollution
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A warm water port is essential to getting shipping and fishing boats in and out when other ports are frozen over in the winter.