Ox bow lake is a U shaped lake formed when a meander of a river is cut off. This cut off meander creates a free standing water body called Ox bow lake.
The Great white spot (Great white Oval) is a phenomena associated with large periodic storms in the atmosphere of Saturn which are visible from the planet Earth.
Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz. In general, humans can hear sounds with a frequency between 20 Hz and 20 kHz.
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