WATERWAY

Some of the world’s finest roads make use of bodies of water. They are called canals. Canals are man made waterway. They are usually straight and narrow. But they are filled with water. They connect rivers and lakes, oceans anh lakes, rivers, and oceans and oceans so that boats and ship can go from one to the other.
Most canals are used for transportation. Barges, boats, and ships carry good over canals. Some are used to irrigate land or to carry sewage from large cities. Canals also reduce the cost of shipping goods and offer travel short cuts.
Canals even go over hills and mountains. But you know that water can’t flow up a hill, so how can thewater and boats in a canal go up a hill?
Something called a lock is used. It is a giant tank. The tank is big enough to hold a long boat. The boat floats into the tank, and the door behind it are closed to lock the boat in there. Then more wateris let into the tank. When the tank is full of water, the tank door in front of the boat is opened and the boat floats out. The boat floats higher and higher as the water rises. It floats either our into a higher part of the canal or into another tank or lock, which will lift it still higher.
To go down the hill on the other side, the boat enters a lock that is full of water . as the water is let out of the lock, the boat will float lower and lower. So locks make it possible for boats or ships to move from one water level to another.