We all rushed to the summit of Mount Everest, panting and full of interest to climb towards the summit of Mount Everest, overcoming the difficulties and obstacles on the way on the snow-capped mountain of Mount Everest, seeing the snow-capped highest peak of Mount Everest looming in front of us, faintly, it was so exciting, it seemed so fascinating, we were about to defeat ourselves, defeat Mount Everest, we could be relaxed and happy, and enjoy standing at the highest point of Mount Everest to enjoy the beautiful scenery of the high mountain and man-made peaks, thinking about it was exciting, but when we were only a few hundred meters away from the peak, we suddenly heard the Sherpa boy say to us urgently"It's not good, there's danger up there, everyone hurry up and run, don't stop." We couldn't help but look up, it turned out that there was an avalanche, with a gentle click, the layers of snow on it broke, and the white, layers of snow and snowboards rose in response to the sound - as if the mountain god suddenly launched an internal force to shake off a white robe on his body, and like a white snow dragon soaring through the clouds, roaring down the mountain, like a white waterfall, rushing wildly. Those Yanshan snowflakes as big as a mat of snow continue to roll down from above, the piece of blowing snow is overwhelming to us to split our heads and brains, like a violent, vicious, white demons scattered from the head towards us desperately, unscrupulously grinning, teeth and claws rushing wildly, we judge the situation, the avalanche up is estimated to reach 200 kilometers per hour, first from the upper part of the slope covered with snow. A crack appeared, and then a huge body of snow began to slide. In the process of sliding downward, the snow body quickly gains speed and rushes towards us, because the snow is very soft, the adhesive force is relatively small, these small pieces are destroyed, and the remaining part will be like a plate of loose sand or dominoes, creating a chain reaction and falling rapidly, as these huge snow bodies continue to fall, the speed also becomes rapid increase, it looks like a terrible roaring and shouting snow monster, terrifying, and more terrifying than the avalanche itself is the air wave in front of the avalanche. Because avalanches move downward with a lot of potential energy from a height, they cause violent oscillations in the air, forming a layer of air waves at a very fast speed. This air wave is similar to the shock wave generated when an atomic bomb explodes. The snow wave can drive away the air wave in front of it, and the impact of this air wave is more dangerous than the blow of the snow flow itself, and the air wave has turned the earth upside down, and the air wave has swept all the obstacles in its path to the back, and it has also swept the debris of the rocks on the ground into the sky, and it has rained down stones with a dingdong dong. None of us had ever seen an avalanche before, but this was an eye-opener, and by instinct, we were all like a swarm of headless flies, and we were about to rush down the hill in a desperate hurry, when the Sherpa boy quickly stopped us: "Don't run around, everyone, because it is dangerous to run down, and it may bury the ice and snow." So in either case, we had to get away from the avalanche path right away, and the snow and ice were falling down the mountain, so it was safer for us to run up the hill next to us, so that we could avoid the avalanche or run to higher ground. "Time is pressing, imminent, we hurriedly desperately fought for the old life like panting like a sharp arrow rushed to the side, and after running a long distance, we found a rock with abrupt edges and corners next to it to hide, and watched the changes, fortunately, this avalanche is not endless, slowly, the snow is much smaller, gradually stopped, we look back at the place just stayed, has become a small snow mountain.

Zeng Lu stuck out his tongue and said in fear: "It's so dangerous, if we accidentally run down the mountain, can we escape?"

Xiao Fei listened, after thinking for a while, he said unhurriedly: "It's really dangerous just now, we are really lucky, there is no danger, otherwise the consequences are really unpredictable, such as the avalanche is very large, when it is very close, it is impossible to get rid of, you can find a cover nearby, such as a rock and hide behind it; when there is nothing to rely on, lean forward, cover your face with your hands to avoid suffocation caused by the ice and snow pouring into your throat and lungs, and it is also convenient for the movement of your hands after the avalanche stops." Hold on to anything solid next to the hillside, such as a standing rock. Even if you fall into it for a while, the snow will eventually finish down, and you can get out of danger at that point. If you are washed down the slope by an avalanche, try your best to climb up to the surface of the snowdrift, lie flat, move at the bottom of the avalanche in a crawling position, and make a large cave around you as much as possible when resting. Try to reach the surface before the snow sets. Throw everything away, save your energy, and call out when you hear someone coming. At the same time, swim upstream, backstroke or dog climb upstream, escaping to the edge of the snow stream. After the avalanche, people are buried under the snow, almost isolated from the outside world, with the extension of time, people become colder, when the core temperature of the human body, here is the temperature of the internal organs, not the body surface temperature, when it drops below 32 degrees, this part of the human organ will stop working, the human body will first ensure the work of the heart, so the first to drop is the temperature of the limbs, so buried under the snow will feel numb in the limbs, and then other organs begin to cool down, if the outside is still cold, it will eventually cause the heart to stop working. After more than fifteen minutes, the cold will affect the normal functioning of the body. If you can't climb out of the snowdrift, reduce your activity and slow down your breathing to conserve energy. According to a recent study by the University of Innsbruck in Austria, 75% of people died 35 minutes after being buried in the snow, and only 3% were successfully rescued after 130 minutes of being buried. And if a person is buried in a snowdrift and cannot be rescued for half an hour, there is little hope of survival. We often see reports of someone who was skiing in an avalanche and died. But at that time, it was not known whether the avalanche was actively hurting people, or it was forced to occur under the influence of human movement, so it was necessary to save yourself as much as possible and rush out of the snow. Behind the beauty of the avalanche lies a horror that can destroy everything. The power of the avalanche is known as the White Demon. The impact of an avalanche is staggering. It sweeps away everything in sight with great speed and great power. Some avalanches produce powdery and devastating snow clouds that sweep everything away. It is estimated that an avalanche with high-speed movement will bring 40~50 tons of force to the surface of the hit object per square meter. There is simply no object in the world that can withstand such an impact. On April 12, 1981, a block of ice about the size of a house slid down the top glacier of Alberta's Three Buddha Volcano and landed on a nearby snow slope, causing millions of tons of snow to roll down rapidly, destroying all 13 kilometers along its path. According to experts, the avalanche produced a 160-kilometre-long powdery snow cloud, the worst ever recorded. In fact, once this natural monster, which can reach speeds of up to 400 kilometers per hour and engulf entire cities, starts to move, we will have to take it all down. Avalanches, like wars, bring endless disasters to people, and they seem to be indissolubly linked. There have been many avalanche-related wars in history. There used to be a very famous military power in northern Africa called the Carthaginian Empire. Later, this empire fought several wars with the Roman Empire on the northern shore of the Mediterranean due to conflicts of interest. In 218 B.C., the famous Carthaginian general Hannibal was ordered to make an expedition to the Roman Empire, and he commanded 38,000 infantry, 8,000 cavalry and 37 elephants, detoured through Spain and France, and crossed the snow-capped Alps at the end of October. Because Hannibal lacked the knowledge of avalanches, his troops were overwhelmed by avalanches in the Alps and suffered heavy losses, losing 18,000 soldiers, 2,000 horses, and several African elephants. In modern times, the French Emperor Napoleon was preparing to invade Italy, separated by the snow-capped Alps. Napoleon was much more clever than Hannibal, and he first sent spies to the mountains to reconnoitre. In 1796, Napoleon personally led an army of 40,000 troops, lined up in a 30-kilometer long snake formation, and crossed the snow-capped Alps from northwest to southeast. Despite Napoleon's thorough preparations, the avalanche in the Alps buried nearly 1,000 of his soldiers. During World War I, Italy and Austria fought in the Troll region of the Alps, and no less than 40,000 people died in avalanches on both sides. Both sides often deliberately bombarded snow-covered slopes with artillery, creating artificial avalanches to kill and injure the enemy. Later, an Austrian officer lamented in his memoirs that the Alps in winter were a more dangerous enemy than the Italian army. ”

Hu Jiaojiao listened with relish, and she asked curiously: "Brother Xiaofei did speak wonderfully, but if I were all buried in a snowdrift, which was white and vast, and I couldn't see the sky or the ground below, how would I know where to get out?"

Xiao Fei smiled slightly and said: "This requires you to stay calm, in fact, the method is very simple, when you are buried in snow, let the saliva flow out to judge the upper and lower, and then strive to dig up." When going upstream, you may have to keep your hands at the rocks and ice, but be sure to try to climb up to the surface of the snowdrift. ”

Hu Jiaojiao asked curiously: "Oh my God, it's really strange, it's really unbelievable, unexpected, why did this happen without warning, it happened silently, it's really incredible, this sky is still clear, blue sky and white clouds, the sun is shining on the snow, a piece of shiny, how beautiful, how can an avalanche happen?"

Xiao Fei smiled slightly and was very unthinking, beaming, chattering: "Actually, this question is very simple, let me talk to you slowly." The main cause of avalanches is that the snow on the slopes is too thick. When the snow is exposed to sunlight, the surface snow melts and the snow seeps into the snow and the slopes, reducing the friction between the snow and the ground, and at the same time, the snow layer begins to slide downward under the action of gravity. A large amount of snow slides and causes avalanches. In addition, the snow cracking surface of the earthquake operation can also cause the snow to slide and cause avalanches. Avalanches often occur in mountainous areas, some of which occur during heavy snowstorms, but they often occur when the snow is too thick to exceed the frictional resistance of the mountain slope surface. One of the causes of avalanches is the slow formation of deep hoarfrost beneath the snowdrifts, which is a hexagonal cup-shaped crystal of ice similar to the ice ballast we usually see. This hoarfrost is formed by the evaporation of snow particles, they are much looser than the upper snow, forming a weak zone between the ground or lower snow and the upper snow, and when the upper snow begins to slide down the hillside, this weak belt acts as a lubricating effect, not only accelerating the snow sliding down, but also driving the surrounding snow that does not slide. You may not realize it, but in fact, there has always been a kind of contest on the snowy mountains: gravity must pull the snow downward, and the cohesion of the snow wants to keep the snow in place. When this contest reaches its climax, even the slightest outside force, such as the running of animals, falling stones, wind, slight shaking, or even shouting in the valley, just a little more pressure than the cohesive force that condenses the snow particles into clumps is enough to trigger a catastrophic avalanche. For example, windy. Not only does the wind cause a large amount of snow to accumulate, but it also causes snow particles to condense, creating a hard, brittle layer of snow that can slide along the layer below and cause avalanches. However, in addition to the slope morphology, these avalanches are largely dependent on human activity. Experts estimate that 90% of all avalanches are caused by victims or their teammates, and this type of avalanche is known as a man-made recreational avalanche. Skiing, hiking, or other winter sports enthusiasts often inadvertently become the trigger for avalanches. So I thought that this avalanche might have been caused by a man-made disaster caused by our climb of Mount Everest. Hu Jiaojiao nodded as if she didn't understand, with an expression of admiration, which was really cute and anxious.