Why is the soil so sandy on top of the mountains where I live?

Question

I live in TN and when I go to the mountains the soil everywhere is nothing but sand. It looks just like Florida soil. Why?!?

Answer 1

It's likely due to the lithological make up the mountains where you live. It's probable that the rock at the top the mountains is a sandstone which has been weathered and become loose sand.  

Answer 2

Any soil type sediment in the hill tops has been washed away by rain and carried into the valley.