Best Answer: The initial size of the star is what decides. A star is huge, I mean really big, and all that gravity wants to pull itself together (everything attracts). So, the star wants to collapse. But, it creates nuclear fusion, and that is the force that pushes the star out.
2015-11-20T10:18:22-05:00. agricultural. The largest use of the world's water is used for irrigation or agriculture. This is because the high demand of food thus agricultural products are demanded to supply at a rapid amount in just a short time. The population growth influences mainly the use of resources and one is water. Fresh water only amounts little to the drastic needs of society today and much is used for agriculture as studies suggest.
Seventy percent of all the fresh water is used for irrigation. 1  agriculture uses the largest amount of freshwater (70%). 2  40 percent of the world grain harvest is produced on irrigated land, t herefore, a water shortage will become a food shortage. 3  Countries are importing grain as a way to import water.resh water is a finite resource. The amount of fresh water supply provided by the hydrological cycle does not increase. Water everywhere on the planet is an integral part of the global hydrologic cycle. Precipitation originates as evaporation from land and the oceans.