Earth force  In the water  You go out side and search into the water. About seventy-five  percent of the Earth's crust is covered with water, consequently some water should be available.  Water can be greatly effective. Water movement lead to great changes in the superficies of the crustal plates.  More than millions years, the effective rush from water can cut profound valleys into dry desert rocks. For example, in Arizona "the Grand Canyon" was dug by water. Crashing water, can form the landscape. The force from Waterfall makes the rocks to be exhausted. The rock is crushed into pieces and carried by the water and settled in new places where the force of the water always turns the pieces into each other to shape new rock.  Waterfall is constantly retiring due to the rock that is crushing under it.  For example, scholars believe that Niagara Falls is covered by eleven horizontal kilometers (seven miles) of rocks during its lifetime about twelve thousand years. It means that nowadays the position of the waterfall is eleven kilometers upriver of its essential location.In Iran as about fifty percent of cities and  town are made near the waterway, the most destructive is due to the flooding and natural event.  The countries such as Sistan, Kerman and Ghorghan are the ones that has been interfacing with great destructive floods. The flood caused billion dollars expenses for businesses, bridges, roadways, farmland, homes and water treatment facilities.  Most of the people become homeless in flooding. Floods build up mostly in spring and autumn. Thousands of home in all over the Iran, are made on floodplains that is the land encircling by rivers and the other waterways where water naturally pour in them. Consequently flood is unavoidable. The case of water rushing over riverbanks is fewer.This case is called tsunami that is a Japanese word and means shelter wave. Suppose an  very high ocean wave moving on the ocean's surface  with high speed and crashing into the coastlines finnaly. The great  strength of the tsunami can immediately recreate the  landscape. The pressure of the water soften the rock and sand of the beach. Houses and businesses will immediately ruin. Tsunami strike into the town of Seward, Alaska and surrounding society. With almost no alert, the great wave came with high speed into view.While the water became quiet, 106 Alaskans had died and about 84 million dollars of ruin was remained. When the crustal plates under the ocean distribute stock energy and lead to underwater earthquake, a tsunami will be made. Usually this kind of earthquake are not important but sometimes a powerful  quake shakes the ocean floor and because of this the water tremble with it, setting off a ripple effect of waves, head to land. As the waves arrive the surface water along the beach, they collect and shape the great  wave of the tsunami. Nowadays, the National Weather Service monitors tsunami positions in the Pacific Ocean. The people from these countries with Pacific Ocean coastlines attach to early warning systems for their duration. If liquid water can dig canyons and ruin the cities, what does solid water do? The frozen water can act like powerful force. In the coldest sections of the world glaciers is made when snow to come together and shapes great blocks of ice. Just as ice and snow connects to the glacier, it become heavier and bigger. Just as it become greater, it start to move. Their weight, increase the strong of attractive force on the Earth, lead to it to convey and move. Everything like rocks, trees and even mountain in the   glacier's moving direction goes out of the way. But all of snow do not get form the glaciers. Snowdrifts in some sections of the world, congeal solid and do not shape glacial ice. Generally, in mountain region there are deepest snowdrifts and they are at high altitude. This mountains are in abrupt grade. While a great drift ofsnow connects to the side of a mountain, it endure attractive force and strength of its own weight. A avalanche will make while the great snowdrifts subside their fixture and fall down the mountain in a terrible wave. The strength from the freeze snow's motion is   strong enough to ruin everything that is in its way. People who live near the mountain region know how pay attention to the alert indication of avalanche. Because of learning more about avalanches, brows these chosen websites.