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我们生活的地球,平均半径为6371.004千米,表面积为5.11×10~8平方千米,体积达1.083×10~(12)立方千米,平均密度为5.518×10~3千克/立方米,质量为5.974×10~(24)千克,还有数以亿计的人类及其他生物生存在其上,显然是个庞然大物。地球是一个有生命的星体:高山是它的筋骨,流水是它的经络,岩浆犹如它的血液,地震显示它的脉搏。它日夜周转,终年不停,翱翔在宇宙空间;它时而宁静,时而咆哮,展现出排山倒海之势,
The earth we live in, with an average radius of 6371.004 km and a surface area of 5.11 × 10 ~ 8 km 2, has an average volume of 1.083 × 10 ~ (12) km 3 and an average density of 5.518 × 10 ~ 3 kg / m 3. The mass For 5.974 × 10 ~ (24) kg, there are hundreds of millions of human and other living on it, apparently a monster. The Earth is a living planet: the mountain is its bones, the flowing water is its meridian, the magma is like its blood, and the earthquake shows its pulse. It is working day and night, year-round non-stop, soaring in space; it quiet and sometimes, sometimes roaring, showing the overwhelming trend,