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Science riddles

I Like To Roam But Always Stay Home
Riddle:
I like to roam but always stay home. If you carried what I carried you'd break your back. What am I?
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I Am Needed For Flight But Cannot Fly On My Own
Riddle:
I am needed for flight but cannot fly on my own. What am I?
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Occasionally Associated With Smelly Things
Riddle:
I am occasionally associated with smelly things. What state of matter am I?
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Black When You Buy It, Red When You Use It
Riddle:
What is black when you buy it, red when you use it, and gray when you throw it away?
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I Can Eat a Lot Of Iron
Riddle:
I can eat a lot of iron without getting sick. What am I?
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You Can't See Me, But I Can See You
Riddle:
You can't see me, but I can see you. To be more specific, I see through. What am I?
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Enables Plants To Grow
Riddle:
In addition to the sun This is what enables plants to grow It is a four-letter word And it comes before forest and bow What is it?
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Measuring Riddle
Riddle:
What can be measured, but has no length, width, or height?
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I Am a Tunnel...
Riddle:
I am a tunnel, a shortcut that connects places across space and time. What am I?
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It Is Impossible For Me to Be Created
Riddle:
It is impossible for me to be created, and I can never be destroyed, I can only change form. What am I?
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I Am Three-Quarters of the Universe
Riddle:
I am three-quarters of the universe and almost nothing is known about me. What am I?
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A Period of Time...
Riddle:
What period of time weighs the least?
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Full Of Holes But Still Holds Water
Riddle:
What is full of holes but still holds water?
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The Priest's Favorite Part About Physics
Riddle:
What is a Priest's favorite part about Physics?
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I Was Once a Massive Star
Riddle:
I was once a massive star and soon I will be a brightly colored gas cloud. For now, I am a massive explosion. What am I?
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