Collect geographical information in life

See/question/20683038.html1for details. Debris flow Debris flow often occurs in canyons and earthquake and volcano-prone areas, and occurs in large quantities during heavy rains. It is a torrent of mud and stone, which erupts instantly and is the most serious natural disaster in mountainous areas. Frequent zones: Pacific Rim Fold Belt (Mountain System), Alpine-Himalayan Fold Belt, and some folded mountainous areas in Eurasia. There are nearly 50 countries in the world with the potential threat of debris flow. Among them, Colombia, Peru, Switzerland, China and Japan are more serious. There are more than 1000 debris flow gullies in China, most of which are distributed in Tibet, Sichuan, Yunnan and Gansu. Sichuan and Yunnan are mostly rain and mudslides, and the Qinghai-Tibet Plateau is mostly ice and snow mudslides. More than 70 counties in China are potentially threatened by mudslides. In Japan, there are more than 62,000 debris flow gullies, which often erupt in spring and rainy season. 1970, a mudslide occurred in Vascalan Mountain, Peru. More than 5 million cubic meters of snow water, carrying mud and stones, rushed to Rongay, Peru at a speed of 100 km per hour, killing 23,000 people. The scene of the disaster was terrible. 1985, the debris flow in Mount Ruiz, Colombia hit nearly 30,000 square kilometers of land at a speed of 50 kilometers per hour, including towns, villages and fields. The city of amero is in ruins, causing 25,000 deaths,150,000 livestock deaths,130,000 people homeless, and the economic loss is as high as $5 billion. Debris flow disaster that people still remember:1On May 6, 1998, Naples and other areas in southern Italy suddenly suffered a very rare mudslide disaster since the founding of the People's Republic of China. More than1000 people died, more than 200 people were missing and more than 2000 people were homeless. Fowler, a 56-year-old from sarno Village, was awakened by a strange noise in his sleep and wanted to open the door to see what was going on. His wife turned on the light for him. Just as Fowler opened the door, a huge mud flow knocked him to the ground. His wife reached out in horror and tried to pull her husband up, but more mud kept pouring in and the mud kept rising. She had to jump on the table to take refuge and watch her husband be swallowed up by the mudslide. In this way, many people were silently washed away by mudslides, and even had no chance to call for help. Due to the increasingly serious destruction of our ecological environment, after entering the 20th century, the frequency of debris flow in the world has increased sharply, with the frequency exceeding 100. 2. Hurricanes Hurricanes, also known as typhoons and tornadoes, are tropical cyclones formed near the equatorial ocean. Hurricanes often travel thousands of kilometers, sweeping through many countries and causing great losses. The Caribbean, Bay of Bengal, China and the Philippines are the most severely affected areas on earth, followed by Central America, the United States, Japan and India, and the South Atlantic has the least impact. The reason is that the wind source mostly comes from the tropical waters of the Indian Ocean, the Pacific Ocean and the Atlantic Ocean. On September 1999, Hurricane Floyd hit the eastern United States, killing at least 47 people. Since it landed on the southeast coast of the United States on September/0/4, it has successively attacked Florida, Georgia, South Carolina, North Carolina, new york and Washington, D.C., causing serious casualties and property losses. The maximum wind speed is about 200 kilometers per hour, and it drops below 100 kilometers per hour after two days, and it has turned into a tropical storm. Where Hurricane Floyd passed, there was heavy rain, which caused many places to be flooded, houses to be damaged, traffic to be interrupted, power supply to be interrupted, and people's work and life to be seriously affected. In South Carolina, North Carolina, New Jersey and Virginia, hurricane * * * caused 6.5438+0.5 million households to lose power. Public schools in New Jersey, Washington, Baltimore, Philadelphia and new york are generally closed, and 3 million students cannot attend school. In addition, flights were grounded and trains stopped, resulting in tens of thousands of passengers stranded. In Washington, many federal government departments only keep staff on duty, and the House of Representatives meeting is postponed, so many activities have to be cancelled. Violent Hurricane Lenny:1999165438+1On October 20th, Hurricane Lenny hit the Virgin Islands at a speed of 217km per hour, causing storms and heavy rains. According to statistics, there are more than 80 tropical cyclones of magnitude 8 or above in the world every year, with about 20,000 deaths and economic losses exceeding 8 billion dollars. In history, there were eight hurricanes that killed more than 654.38 million people. The biggest hurricane disaster in the 20th century occurred in Bangladesh:1970165438+10/2. The hurricane swept Bangladesh with storm surge, causing 300,000 deaths, 280,000 cattle and 500,000 poultry deaths, and the economic losses were incalculable.