Answer:
What do people spend a lot of money on every year but never want to use it?
What can get you there in eco style, pushed by your legs mile after mile?
What has a ring but no fingers?
What is not a ball but yet a sphere, and holds all lands and people year after year?
What can be seen but not touched?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.