Answer:
A supernova results in a massive explosion of a star.
The correct answer is - Watershed.
The drainage basis are places in which all the water in an area is accumulated and ends up in the same place. The drainage systems are divided by highlands, which can vary from small hills to very high mountains, depending on the topography of the place.
The line on the highland that is separating the drainage systems is called watershed. The watershed is simply a line stretching on the highest parts of a highland, thus having a slope on each side.
The earth's crust is broken up into giant slaps of rocks called plates so the answer is B
Mid ocean ridges I think that’s the answer
