Erosion: Key Terms
• Stick the sheet in –
Material carried by the waves bump into each other and so
are smoothed and broken down into smaller particles.
This is the process by which the coast is worn down by
material carried by the waves. Waves throw these particles
against the rock, sometimes at high velocity.
This process involves the force of water against the coast.
The waves enter cracks (faults) in the coastline and compress
the air within the crack. When the wave retreats, the air in
the crack expands quickly causing a minor explosion. This
process is repeated continuously.
This is the chemical action of sea water. The acids in the salt
water slowly dissolve rocks on the coast. Limestone and chalk
are particularly prone to this process.
Corrasion / Abrasion
Processes of erosion
Processes of erosion
1. Headlands and Bays
Headlands and Bays form along coasts which have
alternating ______ of ____ and soft rock. The ______
of the coast is the most important factor controlling the
_____ of the coast.
Headland = where ____ land projects out into the sea,
usually with steep _____ .
Bay = low land, between the __________ , where the coast
has ____________. Usually has a ______.
Retreated Cliffs High headlands
geology shape hard bands beach
Wave cut platform
formed between the
high and low tides as
the waves only attack
the cliff and pass over
2) Cliffs and wave cut platforms
• Waves ____ the base of the cliff to form a
_____ ___ ______ and then over time the
cliff ________ due to lack of support and
_______ . As most of the cliff gets washed
out to sea a _______ is left in its place, a wave
cut platform. It is often _______ due to
• platform gravity Erode
collapses wave cut notch smooth
What will happen to the
part of the cliff labeled A
Formation of Arches, Stacks and
Exposed lines of weakness in the ______ allow
Hydraulic Action to form small _____ along the
base of the cliff. Over time the cave will continue to
grow through _______ ______ and meet another
cave on the other side of the headland forming a
small ______ . ______ will continue and undercut
the base of the arch until it eventually falls due to
lack of support and _______. This leaves behind a
stack which will eventually collapse due to
___________ and gravity to leave a _____.
erosion stump undercutting gravity
caves Hydraulic Action arch cliffs
Use the play doh to explain the formation of arches, stacks, stumps