National Geographic is running a challenge for users to submit photos that "celebrate the beauty of the planet" for Earth Day ...

Let's see those unique peaks, canyons, hoodoos, tufas, colorful strata, arches, mudpots, ect... Color or B&W are permitted. Lighting and color (or tonal contrast for B&W) can be adjusted so long as ...

Color is king in this challenge, so no B&W images. Let's see beautiful flowers, with creative lighting. Plants, such as ferns, grasses and mosses are also allowed. The image can be post processed to ...