地球的灾变（一）张国栋一、历史上的地球灾变我们的地球，是在渐变与灾变两种完全不同形式的变化中演化过来的。渐变即缓慢地变化，这种变化是从百万年计的时间尺度才能较为明显的反映出来的变化，如地壳的板块运动和地质上的构造运动，都属渐变。大山大海的形成主要是板... Catastrophe of the Earth (1) Zhang Guodong I. Historical Catastrophe The evolution of our earth has evolved from two completely different forms of gradual change and cataclysmic changes. Gradients change slowly, a change that is more clearly reflected in the time scales of millions of years, such as the crustal plate tectonics and the geological tectonic movements, all of which are gradual changes. The formation of mountains and the sea is mainly a plate ...