The gigantic Yellowstone Grand Canyon, lined with volcanic rock. With all the effects of hydrothermal activity, river erosion ...

A storm is set to dump sleet, freezing rain and snow on the Midwest on Wednesday before striking the Northeast on Wednesday ...

Nearly half of the United States from the Midwest to Northeast will see snow or a freezing rain mix before the weekend ...

Pennsylvania may not be known for towering peaks, but several mountain ranges wind their way through the state. In fact, the midpoint of the Appalachian Trail is in Pennsylvania. Video above ...

At least 22 states from Oklahoma to Vermont are under ice and snow alerts. An ice storm warning has been issued for the Appalachian Mountains from West Virginia to Pennsylvania, where significant ice ...