An outcropping is rock formation, a place on the earth where the bedrock underneath shows through. Rock climbers love to scrabble up the side of an outcropping.
You can also call an outcropping an outcrop, and both terms come from the sense of crop that means "head or top of a plant." An outcropping allows you to see the very top of a rock formation, the majority of which is buried deeply beneath the earth. Outcroppings are composed of a variety of rock types, ranging from sandstone to granite. In some parts of the world, glaciers carved away the land over time, leaving large rock outcroppings exposed.