Ships are made of metal, but they have secret parts that keep them from sinking in the water. For example, they have big engines that move the ship. These engines are also an important part of keeping the ship from sinking while sealing.
A tank is another important part that is always built into every boat that can float. The tank is always being filled with water, and I'm going to tell you the main reason why in this article.
"Ballast tank" is the name for the big tank. It's mostly used for two things. The tank is where the sip keeps the water it needs to stay on its feet. The most important and first thing the tank does is make it easy to move around in shallow areas. The operator lets water out of the tank when the ship is on the surface. This makes the ship go up, giving it more room to move.
As part of that, the engineers have come up with this way to keep the ship steady when there are waves in the water. So, the tank has been put at the bottom of the boat to make it more stable. But the ballast water that gets let out of the tank is bad for marine life. There are viruses and bacteria in the water that are bad for both people and marine life.
https://en.wikipedia.org/wiki/Ballast tank#text=A tank's ballast is a, along with the hull, to reduce
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