Coastal Landforms

Cave

constant attack on a headlands rocks by destructive waves

Arch

cave enlarges and extends back through the other side of the headland

Stack

continued erosion of the arch leads to the roof collapsing

Stump

further erosion at the base of the stack

Old Harry Rocks

chalk headland, cave + arch + stack + stump

Concordant Coast

rock runs parallel to the sea

Discordant Coast

rocks are at right angles/perpendicular to the sea

Less-Resistant Rocks

clays, sands, easily eroded by the sea, turn into bays

Resistant Rocks

chalk, limestone, withstand destructive waves, protrude as headlands

Swanage Bay

a bay, made of less resistant rock, clays/sands

Durlston Head

a headland, made of resistant rock, limestone