Deposition landforms: Beaches and sand dunes Flashcards
Where are sandy beaches located?
Bays.
What type of beach is located in bays?
Sandy beaches.
Where do constructive waves occur?
Bays.
What type of wave are predominantly at bays?
Constructive.
What type of gradient is at a sandy beaches?
Gentle gradient.
Where are beaches with gentle gradients located?
Bays.
What type of beaches have a gentle gradient?
Sandy beaches.
Where are pebble beaches located?
Coastlines.
What type of waves are at pebble beaches?
Destructive waves.
What type of gradient is at pebble beaches?
Steep gradient.
What type of beaches have destructive waves?
Pebble beaches.
What type of beach has a steep gradient?
Pebble beaches.
What is the first step in the formation of a sand dune?
Sand moved up the beach by the aeolian deposition (wind).
What is the second step in the formation of a sand dune?
Obstacles (e.g. driftwood) decrease wind speed so sand is deposited to form embryo dunes.
What is the third step in the formation of a sand dune?
Embryo dunes are colonised by marram grass. Roots stabilise the sand.
What is the fourth step in the formation of a sand dune?
Sand stabilises forming foredunes and mature dunes. Decomposing vegetation makes the soil more fertile so more vegetation can grow.
What is the last step in the formation of a sand dune?
Dune slacks (small pools) can form in depressions in the sand. These are caused by the wind.
What fluvian process aids in the formation of a sand dune?
Deposition.
When sandy beaches are formed, what type of waves are there?
Constructive.
Why are bays more sheltered?
They are protected by headlands.
What is a berm?
Something that marks the high tide and the extent to the water.
What is the fluvial process involved in the forming of a beach?
Deposition.
Explain the formation of a beach.
Sand and shingle are deposited at the coasts.
Often this happens in bays which are more sheltered.
The waves entering the bay are constructive waves. Which have a strong swash and a weak backwash.
Some beaches are made of pebbles.
These are made from nearby eroding cliffs.
A berm on the beach marks where the high tide line is and the extent to the water.
