AQA GCSE Physical Geography - Coasts

AQA Geography Course, For exams after 2011.

I sat my physical geography paper summer of 2010 and this power point is all the information for Coasts.

There are definitions and Case Studies etc.

Hope you find it useful! 

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Slide 1

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Coastal Features…read more

Slide 2

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Coastal Key
Bay: A Broad coastal inlet usually with a beach
Abrasion: A process of erosion where rocks get hurled at the coastline by waves
Attrition: A process of erosion where rocks collide and parts break off leaving smaller
Bar: A spit that has grown across a bay
Spit: A finger of new land made of sand or single jutting out into the sea from the coast.
Longshore Drift: The zig-zag movement of beach material along a coastline
Prevailing Wind: Dominant Wind, South Westerly in the UK
Hydraulic Action: Air forces cracks in rocks apart
Corrosion: Erosion by acids within the sea.
Weathering: The break up or decay of rocks on the earths surface.
Headland: A Promontory of land jutting out into the sea.…read more

Slide 3

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Onion Skin Weathering
Where Does it Occur?
Above water and normally in hot and cold places such as Deserts
What does it need to happen?
Hot and Cold weather changing in temperature. Increasing and Decreasing rapidly
What Rock Does it Effect?
Rocks which occur in layers ( Metamorphic: Slate )
How Does it Break the Rock down?
The rock in hot weather (daytime) expands and in the cold weather (nightime) it
contracts, this weakens the rock.…read more

Slide 4

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Biological Weathering
Where Does This Happen?
Usually on the top of a cliff where vegetation and animals have access to the rock
Why Does it Happen?
Animals and Vegetation bury into the rock with plants roots, and animals natural habitat
What Type Of Rock Does It Occur?
Soft Rocks, Such as Limestone (they are softer and easy to penetrate)
How Does it Break It Down?
The roots create cracks in the rock therefore weakening it, and animals bury into the ground
looking for food etc, which weakens it more. This then leads to other weathering.…read more

Slide 5

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Freeze Thaw Weathering
Where does it Happen?
Cracks in the cliff where the temperature drops below freezing at night
Why does it Happen?
Water gets into cracks, sometimes from the sea, or from the rain, when it gets to below
freezing over night this water then expands when it freezes and forces the crack bigger
Which Type Of Rock?
Any, it occurs mainly on rocks which have had cracks in them due to other weathering.
How does it break it Down?
The water freezes inside the crack and forces the crack bigger, this then weakens the rock
and leads to the rock being unsteady.…read more

Slide 6

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Chemical Weathering
Where Does it Happen?
Mainly on the top of a cliff, Anywhere the is pollution
Why does it Happen?
The pollution from factories etc can cause acid rain
What type of Rock?
Limestone is very vulnerable, statues and some older buildings are made from this. Limestone
is a soft rock.
How does it Break it down?
The acidic content causes it to corrode. This could eventually over time change the properties
of the statue or building and in 100s of years vanish it completely.…read more

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