Ask for a 7-word composition on earthquake prevention and disaster reduction.

On the earth where we live, there are all kinds of weather conditions, such as ground movement and earthquake.

on may 12th, 28, we will never forget that it was a heartbreaking day. Wenchuan earthquake took away many lives, separated many families, orphaned many children and left many people alone for life. Time can't go back, and we can't change this fact. Only by being strong can we survive at this sad moment and live bravely.

We can't change the disaster, but it can be avoided. Before the earthquake, there will be some omens. For example, livestock such as horses will break free from the reins and run wildly outside; The hibernating snake will gush out of the hole; Bees will fly and flee; Dogs will bark, and some livestock will go out of the circle and run around; Rats move in droves ... These omens can let people know in advance that there will be-hair-life-ground-earthquake. If these animals are found to have these abnormal phenomena, they must first distinguish the true from the false, and then report to the Seismological Bureau, so as to prevent them from happening first and evacuate early.

An earthquake doesn't mean you will die. In fact, there are many ways to save yourself. For example, you are trapped under the ruins in an earthquake. At this time, you should not move blindly, but be calm. First, take out your hand and move the ruins slowly. First, keep breathing smoothly, then try to breathe and call for help. If you are at home in the event of an earthquake, you must immediately get into a small room that is hard and has not collapsed to avoid being hurt. Also, stick to a solid wall or squat at the door, and survive after the house collapses to avoid being hurt. If you are in the wild, you must avoid the steep cliff to prevent you from falling down the mountain. There is also the need to prevent landslides, so as not to slide down. If you are in school, you must obey the teacher's instructions, hide under the desk, and pay attention to protect your head. If you are in physical education class, you should avoid tall buildings and get hurt. If you are in the cinema, you should hide under the viewing chair to avoid the shock, avoid the lights hanging on the ceiling and the hanging objects of air conditioners, protect your head with things, and follow the instructions of the commanders to evacuate. Now there are often earthquakes in shopping malls, and you should avoid glass cabinets, goods, billboards, lights and other items. If you are in a bus, you should hide under the chair or squat down, keep your center of gravity steady and hold the handrail.

Earthquake is a common natural phenomenon, which brings great natural disasters to human beings. China is a country with many earthquakes, and it is an important task to predict and forecast earthquakes.

For a long time, the threat of earthquakes has been as powerful and unavoidable as a thunderstorm in summer afternoon. Unfortunately, the weather forecast has the ability to tell us that thunderstorms are coming, but people are still helpless about the earthquake. Can earthquakes be predicted? Since the early 197s, scientists from Japan, the United States and Russia have been eager to find the answer to this question. In the process of research, various detection techniques, such as observing crustal changes, geomagnetic and geocurrent changes, groundwater level and water quality changes, have been put forward.

The stress energy in the earth accumulates to exceed the strength of rock, and the rock fracture releases energy and an earthquake occurs. Among them, tectonic earthquakes are mainly caused by plate movements: we know that the earth's crust is made up of plates with different sizes, and adjacent plates move with each other in the form of separation, aggregation or lateral dislocation, so that the boundaries of plates are deformed and strain is accumulated. When the strain increases to the extent that the rock strata in the plates cannot be loaded, the rock strata suddenly break and slide, resulting in earthquakes. This sliding surface is called fault plane. In addition to the plate boundary, the rock strata in the inner area of the plate can also feel the force of plate compression or tension and deform and fracture, causing earthquakes.

We have read a lot of materials and made many investigations, and it is confirmed that the cause of the earthquake is that the conditions on the surface of the earthquake and the external conditions of the crust are uneven, and the heat generated in the crust cannot be radiated smoothly and evenly, resulting in the earthquake. Therefore, it is necessary to scientifically develop earthquake resistance and earthquake prevention. In addition to popularizing earthquake-proof knowledge and predicting earthquakes, we can also work hard on buildings and so on.

In a word, the earth is our beautiful home, but sometimes there will be some accidents. Only by actively facing it and developing science and technology for the benefit of mankind can we live happily in this beautiful home.