Tricky riddles

Rocks in the Mississippi River
Riddle:
What kind of rocks are on the bottom of the Mississippi River?
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It Always Stays Hot
Riddle:
I am a food that stays hot even when put in the refrigerator! What am I?
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I Can Be Anything...
Riddle:
Hot or cold, running or still, hard or soft, I can be anything. What am I?
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A Beer That Never Gets You Drunk
Riddle:
I am a beer yet kids can drink me and never get drunk. What am I?
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What can you see in the middle of March?
Riddle:
What can you see in the middle of March and April that you can never see in any other month?
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