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在我们人类居住的地球表面上,有烟波浩瀚的大海,有层峦迭嶂的群山,有万丈悬崖的深谷,有广阔无际的平原。在漫长的地质年代里,这些千姿百态的地形,却能互相变化,互相转换。当今世界最高点的珠穆朗玛峰,原是一片深海,一望无垠的大西洋,也曾是一块陆地,面积巨大的印度次大陆,曾“居住”在南半球,长达数千公里的东非大裂谷,至今仍在加深加宽。是什么力量使苍茫大地沉浮不定?是什么原因造成这“沧海桑田”的巨变?多少年来,人们不断地思考着,研究着,提出了各
On the surface of the earth where we humans live, there are vast waves of sea, layers of mountains, cliffs of deep valleys, and vast plains. In the long geological period, these varied terrains can change and transform each other. Everest, the world’s highest point in the world, was originally a deep ocean, an unspoilt Atlantic Ocean, and once a land. The vast Indian subcontinent once lived in the southern hemisphere and thousands of miles of the Great Rift Valley in East Africa. It is still deepening and widening. What are the forces that make the vast lands ups and downs? What are the causes of this “great changes in the sea?” For many years, people have been thinking, researching, and proposing