Dirt road, North Dakota, USA

Truck carrying barrels on dirt road

Man riding dirt bike in desert

Young woman running down dirt track

Young woman running down dirt track

"Young man pushing bike on dirt track, low section"

Young female toddler with hands in pockets on dirt track

"Rear view of man trail running up dirt track at dusk on Pacific Crest Trail, Pine Valley, California, USA"

"Rear view of young woman trail running down dirt track at dusk on Pacific Crest Trail, Pine Valley, California, USA"

"Rear view of three adult trail running friends on Pacific Crest Trail dirt track, Pine Valley, California, USA"

Woman examining plant roots outdoors

Snow plow working on city street

Stygimoloch, a genus of pachycephalosaurid from the Cretaceous period.

Confrontation between Pectinodon bakkeri and a Stygimoloch.

An American A-10 Thunderbolt using abandoned tanks as target practice.

NASA's Curiosity rover samples a rock on the floor of Gale Crater.

An American A-10 Thunderbolt using abandoned tanks as target practice.

Gardener

Dirt exploding on ground