湖泊是指陆地表面洼地积水形成的比较宽广且水流缓慢的水域,按成因可分为构造湖、火山湖、冰川湖、堰塞湖、泻湖以及人工湖等;按湖水盐度高低可分为咸水湖和淡水湖。湖泊概念中的两个重要事物,一个是洼地;另一个是水体。洼地是一个地貌概念,而地貌的形成主要受制于地质作用。地质作用主要有内力作用和外力作用。内力作用主要使地壳变得高低不平,其中,低下去的部分就会形成洼 Lake refers to the formation of land surface depression depression water is relatively wide and slow flow of water, according to the causes can be divided into tectonic lake, volcanic lake, glacial lake, dammed lake, lagoon and artificial lake; according to the level of salinity of the lake can be divided into Lagoon and freshwater lake. Two important things in the lake concept, one is depression; the other is water. The depression is a concept of landform while the formation of the landform is mainly controlled by the geological function. The main geological effects of internal forces and external forces. The role of internal forces mainly makes the crust rugged, in which the lower part of the formation of depression