Locks are a means of raising or lowering a ship in a canal or river system.
The Great Lakes are connected to the ocean through the St. Lawrence Seaway, a system of locks and canals that allows ships to travel from the Great Lakes to the Atlantic Ocean.
Graphite is the mineral used as a lubricant for locks and in pencils. It is a form of carbon that has a soft, slippery texture, making it ideal for use in these applications.
what sits on the water and warns ships of the danger coast
Depens on how you pose the question. Ships can move far more goods per horsepower than a truck, so they should pollute less. OTOH ships usually burn much cruder (dirtier) oil, so smoke puff by smoke puff they pollute more.
Planes reportedly produce 0.8320 lb CO2/ton-mile and ships 0.0146 lb CO2/ton-mile. The other appended link shows the fuel use for each of several forms of transport (not just cargo vessels) but the data is extrapolatable to others
The Welland Canal contains locks that need to be transited to get to the Atlantic Ocean.
By the use of twist-locks and stacking cones.
Locks are only needed when the ships need to be raised and lowered in altitude because of the terrain the canal crosses.
Ships passing through the Panama Canal must traverse a total of three sets of locks: the Miraflores locks, the Pedro Miguel locks, and the Gatun locks. This journey takes ships from Balboa on the Pacific Ocean side to Colon on the Atlantic Ocean side.
The Soo Locks allow ships to travel between Lake Superior and the lower Great Lakes. The locks pass an average of 10,000 ships per year....
Locks help ships move from one level to another
Ships traveling from Balboa to Colon in Panama cross through one set of locks at the Panama Canal. The Panama Canal has a system of locks that raise and lower ships to the level of Gatun Lake, which is then crossed to reach the other set of locks at the other end of the canal.
Locks are built to raise and lower ships , also to control water levels, so there are some locks that also have dams nearby.
Water locks allow ships to move from one level of water to another through canals.
The Soo Locks were built to allow ships to sail between the lower Great Lakes and Lake Superior. They are also known as the Sault Locks and were built in 1837.
then there would be a flood? No. The Canal has locks to raise ships to the level of Gatun Lake. This lake sit considerably higher than sea level where the ships begin transiting though the Panama Canal. Gatun Lake and it's connecting rivers are used as the main portion of the "canal" to transport ships (close to 30 miles). If you took the locks out, Gatun Lake would drain out. Aside from the environmental impact, that entire portion of the canal would need to be re-dug deeper so that ships can pass through the entire way at seal level.
The 2 locks that are still in use today is the Poe and the MacArthur locks.!!