Use me to reward good behavior. What am I?

Answer: Treat

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More What am I ?

Violet, indigo, blue and green, yellow, orange and red; these are the colors you have seen after the storm has fled. What am I?
Water on wind; Light, I rescind. What am I?
We applaud if you perform well. What am I?
We hurt without moving. And poison without touching. We bear truth and lies, But are not judged by size. What are we?
Weight in my belly, trees on my back. Nails in my ribs, feet I do lack. What am I?
What can always be measured but never can be seen?
What force and strength cannot get through, I with my unique teeth can do. What am I?
What gets sharper the more you use it?
What never asks questions but is always answered. What am I?
What’s strong forever, Never broken. Forged from fire, But never smoking. It’s true value, Not a must. Man for man, We kill in lust. What am I?
When filled I can point the way. But when empty unmoving I stay. What am I?
When I am sad, I change colour from white to grey. My tears fall to the ground and my cries are low and rumbling. In my anger I send great flashes of light above. What am I?