第1个回答 2013-12-29
Rain (rain) from the cloud droplets to land, land and ocean surface water evaporated into water vapor, water vapor rises to a certain height into a small drop of water after the case of the cold, these small water droplets to form clouds, the clouds where they are with each other collision of water droplets merge National Cheng Kung University, when it is big into the air care do not live, when falling behind down from the clouds to form rain. Rain causes of the diversity of its manifestations are also distinctive, with drizzle, there is incessant rain, as well as under the torrential showers. Rainwater is the most important human life, fresh water resources, plants also rely on rain to nourish and grow. However, the floods caused by heavy rains also caused tremendous suffering to human beings.Earth's water under sunlight irradiation, it becomes water vapor is evaporated into the air went. Encounter the cold air at high altitude water vapor can gather into small water droplets. These small droplets are very small, only 0.01 to 0.02 millimeters in diameter, the largest is only 0.2 mm. They are also small and light, was in the air updraft care in the air. Is that these small water droplets in the air and gather into clouds. These small water droplets to turn into raindrops fell to the ground, which is about to be increased more than 100 million times. These small water droplets is how to make their volume grew to more than 100 million times it? It mainly rely on two instruments, one is the condensation and sublimation increases. The second is to rely on cloud droplet collision and increase. In the early stages of the formation of raindrops, cloud droplets mainly depend on continuously absorbing the water vapor cloud around the body to make its own condensation and sublimation. If the water vapor cloud body to be able to continuously supply and supplement to the cloud droplet surface, often at too saturated, then the condensation process will continue, with the growing cloud droplets become raindrops. But sometimes cloud the water vapor is limited, in the same piece of cloud, the water vapor is often in short supply, so it is impossible to make every cloud droplets are larger for larger raindrops, some of the smaller cloud droplets had to be integrated into a larger of cloud droplets and going. If the cloud water droplets and ice crystals coexist inside a case, then this increase in the process of condensation and sublimation will be greatly accelerated. When the cloud of cloud droplets increases to a certain extent, due to large cloud droplets increase the size and weight, they drop the course will not only catch up with slower Xiaoyun drops, but also "annexation" more drops of Xiaoyun allowed itself to expand. When the big cloud droplets get bigger, the last big into the air can no longer care do not live it, begins with self-contained cloud to the ground, our common rain.Are many kinds of rain, in addition to acid rain, there is the color of rain, there are many interesting rain, such as frogs rain, iron rain, golden rain, rain and even money. They are a masterpiece of a tornado.
第2个回答 2013-12-29
From the cloud composed of liquid water drops of water into a body known as the clouds. Of water into the clouds within the cloud droplets increase, if equipped with the conditions for the rain and make rain fall has a certain speed, then landed down is rain or drizzle. The cloud of ice crystals formed by a body known as the ice into a cloud, but by water droplets and clouds composed of ice crystals known as the mixed clouds. From the ice into a cloud or a combination of lowering clouds of ice or snow, falling to 0 ℃ and above the gas reservoirs, the melting of the future has become a rain drop to the ground, forming rain.
第3个回答 2013-12-29
the heat of the sun evaporates the water from the ocaens,seas,rivers and lakes. water vapor is thus formed.this rises and forms clouds in the air.
As the air rises,it is cooled.The higer it rise the more they are colled.this cause more and more water vapor to condense.In this way,the tiny drops of water in the clouds get bigger and bigger until then are heavy enough to fall to the earth as rain.本回答被网友采纳