LiveScience.com: An ancient, fossilized landscape is slowly rising up from the fields of sugar beets and barley in England’s Fens, an agricultural hub near the country’s central eastern coast. Generations of farmers have had to contend with these puzzling, gently sloping embankments ever since 17th-century Dutch workers drained the Fens, an area of low-lying wetlands. It turns out these burgeoning hills are archaic waterways that dried up thousands of years ago. Locally, they’re known as …