Answer:
What goes up when the rain comes down?
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
Temporary evidence of where you've been strolling
Small, containing light, You'll need it in the dark, It will provide that spark, and shine into the night. Will light up any pyre, 'Cause it can help make a fire.
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?