Meaning of perfect numbers. A perfect number: a number is perfect when the sum of its divisors (except the number itself) equals the given number. Theorem connecting perfect and prime numbers. 6 : The divisors of 6 are 1,2,3 & 6.
Â­A watershed is an area of land that feeds all the water running under it and draining off of it into a body of water. It combines with other watersheds to form a network of rivers and streams that progressively drain into larger water areas. Topography determines where and how water flows.Ridge tops surrounding a body of water determine the boundary of a watershed. Imagine turning an open umbrella upside down in the rain.he umbrella is like a watershed; it collects everything that falls into it. Waterways within the watershed all feed into that main body of water, which could be a river, lake, or stream. The beginnings of a water source are called headwaters.
Watersheds are basically the areas that water flow in order to reach the ocean. For instance, a creek is part of the watershed of the St. Joseph River, which is a part of the â¦ Great Lakes Watershed, that is a part of the St. Lawrance Seaway Watershed which filters into the Atlantic.stuaries are places where it is half salt water and half fresh water it is important because salt water has more minerals and fresh water has more oxygen so it is kind of lik â¦ e the best of both worlds for the animals who live there.