Lakes

Lakes without external outlets may be linked with inland drainage areas. In exams remember closed basins with inland drainage.

Water hyacinth can cover the water surface and affect light and oxygen. In exams link invasive plants with water quality.

Tectonic lakes are linked with depressions formed by crustal movements. In exams connect the word tectonic with earth movements.

Salinity in lagoons may change as the mix of sea water and freshwater changes. In exams understand lagoon salinity through water mixing.

Waste treatment and soil conservation protect lakes from pollution and silt. In exams connect conservation with treatment and catchment management.

Shrinking lake area can affect activities like fishing and tourism. In exams connect social impact with livelihood.

Lakes are often part of wetland systems and support biodiversity. In exams link lakes and wetlands as habitats.

Waves and coastal currents can form sand barriers and create lagoons. In exams link coastal processes with lagoons.

Declining water quality affects both aquatic organisms and human use. In exams connect pollution impacts with both life and society.

Rainfall and evaporation seasonally change water level. In exams link water level with water balance.

The importance of lakes appears in water resources, biosphere and tourism. In exams use the term multipurpose.

The location and outflow of lakes may differ. In exams identify water bodies correctly on maps.

Reducing soil erosion in the catchment lowers silt reaching the lake. In exams link silt control with catchment management.

Origin-based classification helps in understanding lakes scientifically. In exams identify lakes by their formation process.

A lagoon is linked with coastal processes, an oxbow lake with river meanders and a tectonic lake with crustal movement. In exams make origin the main identity.

Lake water is relatively still, so pollutants may remain for a longer time. In exams remember the link between stagnant water and water quality.

Through a permeable bed, some lake water can seep down and increase groundwater. In exams connect lakes with both surface water and groundwater.

Landslide material can make a lake shallow. In exams remember sedimentation and blockage as risks for mountain lakes.

When velocity decreases the river can deposit its sediments in the lake. In exams link lakes with both deposition and water storage.

Controlled outflow allows lake water to be used according to need. In exams connect artificial reservoirs with irrigation and water supply.