Fine-grained bed of ephemeral lake in a desert is also known as
Playa
Oasis
Drumlin
Natural levee
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This question was previously asked in
UPSC NDA-2 – 2021
A playa (also known as a dry lakebed or alkali flat) is a basin or depression that holds water only temporarily, usually after rain, forming an ephemeral lake. As the water evaporates in the arid conditions, fine-grained sediments (silt and clay) are left behind, forming a smooth, flat, dry surface.