Lake

The shallow area near the shore where sunlight reaches the bottom, allowing for rooted aquatic plant growth (macrophytes).

Lakes are generally divided into four distinct zones based on physical, chemical, and biological characteristics: The shallow area near the shore where sunlight

Deepest lakes, such as Lake Baikal, often fill a graben (a rift between fault lines). Deep lakes often form a three-layered structure in

The deep, cold, and dark zone below the light penetration level, often having low oxygen levels. created by glacial

Deep lakes often form a three-layered structure in summer: a warm upper layer ( epilimnion ), a middle transition layer ( metalimnion ), and a cold bottom layer ( hypolimnion ).

Most natural lakes in North America were formed by glaciers, though Maryland, for example, is notably missing natural lakes because it was never glaciated.

Lakes are often temporary features on a geological timescale, created by glacial, tectonic, or volcanic processes, and eventually filled in by sedimentation.