Boats float on top of the water and carry people across rivers.
A boat pushes water out of the way and the water pushes back up. That gentle push keeps the boat floating.
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Big ships carry cars, food and toys across the ocean to other countries.
Submarines can dive deep down under the water.
Sailboats use the wind to push their big sails and move along.
Ferries carry people and cars across the water to the other side.
The biggest cargo ships can carry more than 20,000 boxes of goods.