A river delta forms where a river enters a standing body of water and deposits sediment faster than waves, tides and currents can remove it. Deltas ar
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Alluvial fans are fan-shaped sediment deposits that form where streams emerge from confined valleys onto flatter terrain. They are common in arid and
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Columnar basalt is a striking volcanic rock formation in which cooling lava is divided into long, polygonal columns. The geometry is natural: it devel
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Fossils are most informative when their geological context is recorded. The position of a fossil within a bed, its relationship to other fossils and t
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