Iceland, sheep running on gravel road, rear view

Gravel and sidewalk

Gravel at base of tree

Gravel at base of tree

Bricks set on top of sack of gravel

Gravel along edge of tiled patio

Discarded plastic bottles in garbage can

Woman sitting on the ground holding handful of gravel, smiling at camera

Woman sitting on the ground, looking down at handful of gravel

Woman sitting on ground with knees up, tossing handful of gravel into air, smiling

Little girl walking on gravel

Gravel and tile striations, close-up

Patterns raked in gravel, close-up

Gravel on dish and stones

Patterns in gravel, close-up

Patterns raked in gravel, close-up

Gravel path leading through botanical garden

Patterns raked in gravel, close-up

Patterns raked in gravel, close-up

Gravel lookout area, lake in distant background

Square dish containing gravel and smooth stones

Raked gravel in rock garden, close-up

Simple illustration of urinary system. Kidney and ureter are shown in cross-section to reveal calculi causing obstructions at various sites.

Vesicle Kidney Stones Unlabeled

illustrated letter pad of summer scenery

illustrated letter pad of summer scenery

shape of stones on top of blue paints

Gravel