how are beaches formed
Formed by accumulation of sand, shingle, or pebbles between high and low tide marks.
constructive waves
build beaches by depositing material.
destructive wave
erode beaches.
how does spits form
Long ridges of sand or shingle extending from the coast into the sea, formed by longshore drift.
(A hook may form at the end if wave direction changes.
Behind the spit, salt marshes and mudflats often develop.
Example: Spurn Head, Holderness Coast.)
how does a bar form
When a spit grows across a bay and joins two headlands, cutting off the bay to form a lagoon.
Example: Slapton Ley, Devon.
how does a Sand Dune form
Formed when wind blows dry sand inland, depositing it around obstacles
marram grass stabilises dunes, allowing them to grow into dune systems.
