A spit is a land form found off coasts. It forms when
sediment builds up and a landmass is left. The sediment is deposited by waves. This is
called longshore drift. When a spit forms, one end remains connected to the land while
the other end exists in open water.
A salt marsh is "an
environment between land and salty or brakish water, dominated by dense stands of
salt-tolerant plants such as herbs, grasses or low shrubs." Salt marshes occur on
low-energy coasts in temperate climates and
high-latitudes.
A mudflat (aka tidal flats) is a coastal
wetland that forms when mud is deposited by tides or rivers. "Mudflats may be viewed
geologically as exposed layers of bay mud, resulting from deposition of estuarine silts,
clays and marine animal detritus.
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