ultrasoničan

ultrasoničan

Sound waves that have frequencies higher than what humans can hear, usually greater than 20,000 Hz. Some animals such as bats, a species of cave bird, and cetaceans use these high frequency ultrasonic sounds for communication and navigation.

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Industrie/Domein: Natural environment
Category: Coral reefs
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Industrie/Domein: Festivals Category: Halloween

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Also known as All Hallow's Eve, Halloween is an annual holiday celebrated on October 31st in America, Canada, and the UK. It is supposedly the one day ...