Lake

Deepest lakes, such as Lake Baikal, often fill a graben (a rift between fault lines).

The open water area away from the shore, which is well-lit (photic zone) and dominated by plankton. Deepest lakes, such as Lake Baikal, often fill

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 ). Lakes are often temporary features on a geological

Lakes are often temporary features on a geological timescale, created by glacial, tectonic, or volcanic processes, and eventually filled in by sedimentation. Lake Types by Nutrients: Oligotrophic: Low nutrients, high

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

This is the process of nutrient enrichment (mainly phosphorus and nitrogen) that speeds up the aging and sedimentation of a lake, leading to increased algae growth and lower oxygen levels. Lake Types by Nutrients: Oligotrophic: Low nutrients, high oxygen, clear water. Mesotrophic: Intermediate nutrients and conditions. Eutrophic: High nutrients, murky water, low oxygen. 3. Lake Formation and Evolution

The bottom substrate (sediments) that provides a habitat for burrowing organisms. 2. Physical and Chemical Dynamics