Answer:
A seed am I, three letters make my name. Take away two and I still sound the same.
Upon me you can tread, though softly under cover. And I will take you places, that you have yet to discover. I'm high, and I'm low, though flat in the middle. And though a joy to the children, adults think of me little.
During the 1800's these turned women into hourglasses and is becoming more popular again these days
Don't do this in the shallow end.
Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?