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Nivation hollow – Geomorphic processes associated with snow patches; Oxbow lake – U-shaped lake or pool left by an ancient river meander; Panhole – Depression or basin eroded into flat or gently sloping cohesive rock; Pothole – Natural bowl-shaped hollow carved into a streambed; Plunge pool – Depression at the base of a waterfall
Hollows are a landform on the planet Mercury, discovered during the MESSENGER mission that orbited the planet from 2011 to 2015. Hollows are typically clusters of rimless depressions with flat floors and haloes of bright (high albedo ) material surrounding them.
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Any naturally hollow underground space large enough for a person to enter. cavern A type of solutional cave that is formed in soluble rock with the ability to grow speleothems. cay. Also key. A small, sandy, low-elevation island on the surface of an otherwise submerged coral reef; a type of coral island. Compare atoll. celestial pole
A naturally formed tree hollow at the base of the tree. Multiple tree hollows in a plane tree in Baden, Austria. A tree hollow or tree hole is a semi-enclosed cavity which has naturally formed in the trunk or branch of a tree. They are found mainly in old trees, whether living or not.
Hollow, a low, wooded area, such as a copse; Hollow (landform), a small vee-shaped, riverine type of valley; Tree hollow, a void in a branch or trunk, which may ...