I am present in all, yet invisible to see, I am the spark behind life and chemistry. From gas to solid, I change my form, my presence can be gentle or cause a storm. Who am I?

Category: Who Am I · Difficulty: hard

Hint: I am essential for all forms of life.

Answer

H2O

Explanation

Water exists in various states and is vital for all known life forms.

This is a hard who am i riddle — a tricky one that takes a little thought. The answer is H2O.

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