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What was crater lake formed by

User Or Choban
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Crater lake was formed when a volcanic eruption blew a hole at the top of the mountain. After hundreds of years the crater filled with rainwater and made a 2,000 foot deep semi-heated lake. 
User Alidad
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it is formed by explosion-blowing off the top of the volcanic cone, when volcanic is over a wider depression is formed called caldera. when this depression fill with water it is called crater

User Joe Grund
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