True, You climb a mountain and reach the top., Sounds travel like waves in the air., A sound can hit a wall or a mountain., An echo is a sound that bounces back., An echo is like a bouncing ball., You are a sound player., False, You yell "Hello!" in a loud voice., You hear the echo immediately., The sound disappears when it hits something., You throw a ball against a wall in the text.

Echo 3

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