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Echo Crater In this adventure, you’ll get to yell as loud as you want into a pit crater!! But, first let’s learn what causes echoes and then find out how pit craters are formed. Echoes are caused by sound waves hitti
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Document Date: 2007-11-07 19:42:29
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Echo Crater In this adventure, you’ll get to yell as loud as you want into a pit crater!! But, first let’s learn what causes echoes and then find out how pit craters are formed. Echoes are caused by sound waves hitti