NASHVILLE, Tenn. (WKRN) — Fragile ribbons of ice have been popping out of the ground across Tennessee during the first few days of December. They are called frost flowers and here’s how they form. To ...

A buildup of methane and other fluids in open and closed "systems" in the permafrost could explain why strange, icy mounds sometimes erupt to form giant crater, researchers say. When you purchase ...

Frost: Ice crystals that form on vegetation and objects near the ground when water vapor in the air sublimes (condenses at subfreezing temperatures) directly onto their surfaces. Frost is not frozen ...