The UKs Evolving Physical Landscape Flashcards
Weathering
The physical, chemical or biological breakdown of solid rock by the action of weather or plants
Physical weathering examples
Freeze Thaw weathering and Onion skin
Example of biological weathering
Living things can affect a rock
Chemical Weathering
Chemicals can affect rocks
Rock fall
Fragment of rocks breaking away from the cliff face due to weathering
Landslide
Blocks of rock slide downhill
Mud slide
Saturated soil flows down a slope
Slumping
Saturated soil slumps along a curved surface
Examples of metamorphic rocks
Crystals
Ribbon like layers
Examples of igneous
Gas bubbles and glassy surface
Examples of sedimentary
Fossils and sand or particles
Anticline
A ridge or fold of rock with many layers
Escarpment
Higher areas of resistant rocks like chalk
Dip slopes
Behind the escarpment, gentle sloped follow the angle of the scarp
Vales
Softer slays form lower and flatter ground
Concordant coastline
The rock layers (strata) are parallel to the coastline
Discordant coastline
The rock layers (strata) are at a right angle to the coastline
Joints
Joints are small, usually vertical cracks found in many rocks
Faults
Faults are larger cracks caused by past tectonic movements
What sort of coastline does headland and bays form at?
Discordant
What sort of coastline does coves form at?
Concordant
Hydraulic power
The sheer power of the waves
Corrosion
The affect of rocks being flung at the cliff by powerful waves
Attrition
The knocking together of pebbles, making them gradually smaller and smoother
Traction
Heavy particles rolled along the seabed
Solution
The transport of dissolves chemicals
Suspension
Lighter particles carried (suspended) within the water
Abrasion
Sandpaper affect of pebbles grinding over a rocky platform
Spit
A finger of new land made of sand and shingle, jutting out into the sea from the coast
Salt marsh
Low lying coastal wet land extending between high and low tide
Soft engineering
A technique involving the construction of more environmentally friends, less damaging and arguable more sustainable management soloutions
Hard engineering
A technique involving the front ruction of significant man-made structure to manage the coastline
Hold the line
Using sea defences so coast stays where it is
Advance the line
Use sea defences to move the coast further into the sea
Strategic realignment
Gradually let the coast we erode and move people and businesses away from areas at risk
Upper course
Shallow, narrow, vertical erosion, slow flow, waterfalls
Middle course
Wide, meanders and oxbow lakes, deep
Lower course
Fastest flow, flood plain, deltas, widest, deepest
Traction
Large stones are dragged along by traction
Discharge
Volume of water flowing in a river, measure in cubic metre per second
Helicoidal flow
Corkscrew motion
Inside bend
Slower flow
Outside bend
Faster slow
Thalweg is…
The fastest current which undercuts the bank on the outer bend.
Water stores
Different places where bodies of water are stored
Arcute or fan-shaped
The land around the river mouth arches out into the sea and the river splits many times on the way to the sea creating the fan shape
Cuspate
The land around the mouth of the river juts out arrow- like into the sea
Bird’s Foot
The river splits on the way to the sea, each part of the river juts out into the sea, rather like a bird’s foot
Precipation
Any source of moisture reaching the ground
Groundwater flow
Water seeping deeper below the surface
Surface run-off
Water flowing on top of the ground
Transpiration
Water lost through pores in vegetation
Percolation
Water slowing through the soil layer parallel to the surface
Through flow
Water flowing through the rock layer parallel to the surface
Boscastle flood physical causes
Land was very steep- caused water to travel quick to valley floor,
Ground water was already saturated from previous rainfall- couldn’t absorb more water,
Confluence of 3 rivers
Boscastle floods human causes
Street pattern increased surface run-off,
Cars and vegetation-trapped under bridge creating a dam,
Old sewer system was overwhelmed,
Defences on rivers
Dam H , straightening and deepening the river H , land-use zoning S , wash lands S , storage area S , afforestation S , embankment H and flood walls H
Somerset levels physical causes
Jet streams (high winds) were located over southern England in winter 2014, 12 major storms in winter 2014 More severe gales
Somerset levels human causes
Landscape changed from wetlands to farming and housing,
Less dredging of the the river channels-increased flooding,
Dredging needs to be done regularly
Levees made situation worse