Answer: The choice of a submarine to either sink or float depends on the captain of that submarine. For a submarine to sink the captain just have to allow water to fill the water tank (lock), making the submarine more dense than the water it has displaced. For it to float, it just have to empty the water tank and allow air to fill it.
When a boat in a canal lock sank, the water level will rise, because the volume of the boat has displaced more water, and this displaced water will cause the water level to rise. The space occupied by an object in a water, is equal to the volume of water been displaced.
Judge the likelihood of things in terms of how well they represent a particular prototype.
The continents are not drifting, exactly. They are physically attached to the tectonic plates, which are basically enormous slabs of rock that are stacked on top of each other. The tectonic plates cause the continents to move in a process known as <u>plate tectonics,</u> also causing earthquakes, sink holes, and a number of other natural disasters. I think the best way to make a visualization of this is making a plate of pancakes, and stacking them while only half of each pancake is on top of the previous one, and as it goes up, it becomes more steep, until the point where they fall over.
