4. This earthquake near Yellowstone Park was just one of nearly a million that happen every year all over the world. And as bad as this quake was, many have been worse. Earthquake experts say that the Yellowstone quake of 1959 was about as bad as the one which hit San Francisco in 1906.But the San Francisco quake caused more damage because it struck in a place where there were so many people living. In San Francisco 700 person lost their lives. An earthquake in Japan in 1923 took 160,000 lives. In china in 1920 an earthquake took 200,000 lives. It is easy to understand why earthquake are so feared.
4、在黄石公园附近发生的地震,仅仅是每年全世界发生的上百万次地震中的一次。若就地震灾害而论,有许多地震甚至更严重。地震专家说,1959年的黄石的地震,差不多相当于1906年发生在旧金山的地震。旧金山地震造成更多的破坏,他发生在人口密集地方。在旧金山约700人丧命。1923年发生在日本的地震夺走了16万人的生命。1920年一场大地震发生在中国,20万人死亡。因此,很容易理解人们为什么非常恐惧地震。
5. What causes these terrible shakes of the very ground on which we live?
5、是什么原因造成我们生活的这块土地发生可怕的摇动?
6. To answer that question we must first understand some things about the earth itself. Forty miles deep in the earth is the edge of the outer crust of the earth, and there it is so hot that instead of hard rock there is material much like the hot lava that a volcano erupts. It is the earths 40 mile deep crust with which we are concerned when we seek the cause of earthquake. The earths crust is formed of many different layers of rocks. The layers of rocks are not laid evenly, as a bricklayer would build a wall. Instead, the earths crust is made of rock layers that are often uneven and not perfectly balanced. Because of the great weight pressing down on them, these layers tend to fold downward at weak spots, and this finally causes an actual break in the crust. When this break occurs, or when the sides of an old break slip, the earth quakes, or shakes, while the crust is settling into a new position.
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