The most famous ski run at Big Sky Resort in Montana is called The Big Couloir, and is described as “roller coaster steep.” ...

A steep slope will have a shorter course distance but be harder to run up. A gentle slope will be easier to run up but cover a longer total distance. For a given finishing time, what’s the sweet ...

Landslides are occasional, rapid movements of a mass of earth or rock sliding along a steep slope ... occurring on very gentle slopes because of the way soil particles repeatedly expand and ...

We've rounded up some of the scariest bridges in the world, which are notable for their stomach-churning heights, rickety guardrails, and steep slopes that seem to defy engineering logic.