A harvest sown and reaped on the same day In an unplowed field, Which increases without growing, Remains whole though it is eaten Within and without, Is useless and yet The staple of nations. What is it?
I make ash, but I’m not a bonfire.
I can expel rocks, but I’m not a slingshot.
I can be a mountain, but I’m not in the Himalayas.
I have a crater, but I’m not the Moon.
I erupt, but I don't have a bad temper.
What am I?
It is energy and motion, it can fly across the ocean.
It can listen and even speak, it can see and even seek.
It eats neither fruit nor gruel, it eats energy and fuel.
Better say: It doesn't eat; It is transformed into heat.
What is it?