These beautiful national parks are free to enter every day of the year. Wondering if they're good ones? Trust us—they're ...

A stunning composite image, made up of three years' worth of satellite photos, shows the ancient lava of Libya's Haruj ...

Ferns make for an excellent ground cover, and though they're overall low-maintenance, avoiding these gardening mistakes will ...

The processes that form continental crust from the denser basaltic rocks of the upper mantle may make the lower lithosphere ...