Natural disasters I know. Data and other details .

China is a country with many natural disasters, and how to prevent natural disasters in agriculture is the most important task in agricultural production activities. Natural disasters are scourges that bring adverse consequences to the survival and social development of human beings due to natural variation as the main cause. Agricultural natural disasters refer to natural disasters that affect the normal progress of agricultural production and destroy crop harvests.

Various natural disasters such as floods in the south and drought in the north, freezing rain and snow, typhoons, sandstorms and sandstorms have brought huge losses to people's lives and social and economic development.

In recent years, China's low temperature frost damage, floods and droughts have occurred alternately, and frost, hail, diseases and insects and other disasters have also occurred frequently, which have caused great damage to agricultural production and people's lives. Almost every month there is the possibility of natural disasters, how to prevent and reduce disasters scientifically in time and place, and take effective remedial measures after rapid response after disasters, in addition to continuously improving the level of agricultural disasters, forecasting, early warning, and improving emergency plans, popularizing disaster prevention and mitigation knowledge, improving emergency management capabilities in response to disasters, and enhancing the foresight, initiative, and initiative of agricultural disaster relief work is very important and necessary.

The frequent occurrence of natural disasters in China is related to the monsoon climate. The summer monsoon is unstable and prone to floods and droughts. China is located at the junction of plates, and there are many **. China's mountainous areas are large, and geological disasters are frequent.

In recent years, there have been many natural disasters in China, including typhoons and droughts, which are mainly affected by air currents and temperatures.

There have been many natural disasters in recent years.

(1) Causes: Global warming leads to frequent extreme climate events; The southwest region is a monsoon area, and the winter and spring are dry seasons with little rainfall. In summer, the temperature is high and the evaporation is vigorous; The terrain is rugged, the surface is undulating, and the surface water retention time is short; There are many karst caves and underground rivers, and the storage conditions of surface water are poor. (6 points).

2) Measures: adjust the agricultural structure, cultivate and plant drought-tolerant crops; strengthening the construction of water infrastructure; the development of water-saving agriculture; Reforestation; Rational development and utilization of groundwater. (4 points).

Question Analysis: 1) The natural causes of drought in C are considered from temperature, precipitation and topography. c It is located in the Yunnan-Guizhou Plateau in southwest China, which is the southwest monsoon region, with unstable precipitation, drought in winter and spring, and high temperature evaporation in summer. The Yunnan-Guizhou Plateau has a karst landform with rugged terrain and a lack of surface water; In addition, global warming has led to frequent extreme weather events; The above causes cause drought in land c.

2) To alleviate drought disasters in China, water-saving agriculture can be adopted; strengthening water infrastructure; planting drought-tolerant crops; planting trees and grasses, etc.

**, also known as ground movement and ground vibration, is a natural phenomenon that causes vibration in the process of rapid release of energy from the earth's crust, during which ** waves will be generated. The squeezing and collision between plates on the earth causes dislocation and rupture at the edge of the plate and the interior of the plate, which is the main reason for the occurrence of ** [1].

**The place where it begins to occur is called the hypocenter, and the ground directly above the epicenter is called the epicenter. The most destructive** ground vibrations are called the polar seismic zone, which is often the area where the epicenter is located [2].

It often causes serious casualties, can lead to disasters, floods, toxic gas leaks, the spread of bacteria and radioactive materials, and may also cause secondary disasters such as tsunamis, landslides, collapses, and ground fissures.

According to statistics, there are more than 5 million earthquakes on the earth every year**, that is, tens of thousands of earthquakes occur every day. The vast majority of them are too small or too far away for people to feel; There are about ** that can really cause serious harm to humans.

a dozen or twenty times; There are about one or two cases that can cause particularly serious disasters. What people can't feel must be recorded with a **meter; Different types of instruments can record different intensities and different distances.

There are thousands of various ** instruments in operation in the world, monitoring the movements of ** day and night. [3]

The current level of science and technology has not yet been able to arrive, and it will not be possible for a long time to come. The examples of the so-called successful **** are basically coincidences. For **, what we should do is to improve the seismic resistance level of the building and do a good job of defense, rather than ****. [

Tsunamis are mostly caused by the seabed, or caused by submarine volcanic activity, but generally speaking, large tsunamis are caused by shallow sources caused by the movement of plates on the seabed, and the tsunami is very destructive, but the early warning system of many coastal countries has been very perfect, and it will give early warning to the residents of the seaside at the first time to ensure the safety and ......... of life and property

Tsunamis are marine disasters caused by eruptions of seabed or volcanoes.