Lakes are formed when glaciers cut holes in loose soil or soft bedrock, depositing material, or leaving buried chunks of ice. These chucks of ice melted to leave lake basins. When these gaps or holes filled with water, they became lakes. The study of freshwater is known as Limnology.
The current chemical and biological conditions of a lake depend on many factors, including:
The physical, chemical and biological characteristics of lakes are extremely variable. These variable include: