A hole in the ground is a type of geological formation that can be created by a variety of natural processes. A CRATER is a large, bowl-shaped depression in the ground caused by a meteorite or other celestial body impacting the Earth's surface. A CAVE is an underground opening in the Earth's surface, often formed by water erosion. A PIT is a large hole in the ground, usually deeper than it is wide. A MINE is an excavation in the Earth from which minerals or other materials are extracted. A GORGE is a narrow valley with steep sides, often carved out by a river. A CANYON is a deep ravine between two cliffs, typically formed by a river over a long period of time. A BURROW is a tunnel or hole dug into the ground by an animal for shelter or habitation.