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Submarines can dive deep down under the water.

Submarines can dive deep down under the water.

They fill special tanks with water to sink down. To come back up, they push the water out with air.

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Boats float on top of the water and carry people across rivers. Boats float on top of the water and carry people across rivers. Big ships carry cars, food and toys across the ocean to other countries. Big ships carry cars, food and toys across the ocean to other countries. Sailboats use the wind to push their big sails and move along. Sailboats use the wind to push their big sails and move along. Ferries carry people and cars across the water to the other side. 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. The biggest cargo ships can carry more than 20,000 boxes of goods.