Answer:
Name four days of the week that start with the letter “T.”
Even if you throw it away, it still comes back.
In many hallways you would stand, if not with this in hand.
A gentleman whose offspring have successfully produced offspring of their own.
It's been around for millions of years, but it's no more than a month old. What is it?
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.