板块的重力滑动和下沉(和低密度的物质从下面漂浮上升密切相关)对驱动板块是重要的,并且表明在板块运动和岩石滑动的机制之间有物理上的相似性。另一方面,这两种现象之间不仅在规模上而且在别的一些方面也存在一些根本差别。板块构造和海底扩张地壳和地幔结构板块构造的概念是指巨大的、相当刚性的 Gravitational sliding and sinking of plates, which are closely related to the rising and falling of low-density material from below, are important to the driving plate and show a physical similarity between the plate movement and the mechanism of rock slippage. On the other hand, there are some fundamental differences between the two phenomena not only in size but also in other areas. Plate tectonics and submarine expansion The concept of crustal and mantle structural tectonics refers to a large, fairly rigid