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Erosional submarine canyons slope downward and lead to alluvial fan valleys with increasing depth. [2] It is in this zone that sediment is deposited, forming the continental rise. Alluvial fans such as the Bengal Fan, which stretches 3,000 kilometers (1,900 miles), make up one of the largest sedimentary structures in the world. [1]
How the World Changed, was broadcast in the US as part of PBS's Secrets of the Dead series. [42] However, Keys and Wohletz's ideas lack mainstream acceptance. Reviewing Keys' book, British archaeologist Ken Dark commented that "much of the apparent evidence presented in the book is highly debatable, based on poor sources or simply incorrect ...
These canyons are often V-shaped, and can sometime enlarge onto the continental shelf. At the base of the continental slope, there is a sudden decrease in slope angle, and the sea floor begins to level out towards the abyssal plain. This portion of the seafloor is called the continental rise, and marks the outermost zone of the continental ...
A pediment, also known as a concave slope or waning slope, [1] is a very gently sloping (0.5°–7°) inclined bedrock surface. [2] It is typically a concave surface sloping down from the base of a steeper retreating desert cliff , escarpment , [ 3 ] or surrounding a monadnock or inselberg , [ 4 ] [ 5 ] but may persist after the higher terrain ...
Subsided house, called The Crooked House, the result of 19th-century mining subsidence in Staffordshire, England Mam Tor road destroyed by subsidence and shear, near Castleton, Derbyshire Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities.
Panhole: a shallow depression or basin eroded into flat or gently sloping, cohesive rock. [2] Collapse-related: Sinkhole: a depression formed as a result of the collapse of rocks lying above a hollow. This is common in karst regions. Kettle: a shallow, sediment-filled body of water formed by melting glacial remnants in terminal moraines. [3]
Downcutting, also called erosional downcutting, downward erosion or vertical erosion, is a geological process by hydraulic action that deepens the channel of a stream or valley by removing material from the stream's bed or the valley's floor.
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...