coasts dont know/facts Flashcards
3 effects of glaciers
- make U shaped valleys
- leave behind glacial features eg ribbon lakes
- leave boulder clay
igneous rock eg
granite
contains crystals of quartz - very resistant
found in devon/cornwall
metamorphic rock eg
slate
when mud is compressed - very resistant
found devon/cornwall
sedimentary rock eg
clay
low permeability formed from muds
found - holderness
south downs human impacts
- agriculture
- forestry
- settlements
southdowns - agriculture
85% of area is farmed
6% of employment
decline in chalk grassland due to chemicals
southdowns - forestry
- 24% of park
- large areas cleared
- mix of deciduous and coniferous
some removed for new trees eg old lime woodland
southdowns - settlements
- 120,000 people live there
- use local building materials
- decline in community facilities
disconcordant coast
DIFFERENTIAL EROSION
size of wave factors
- wind strength
- how long wind blows for
- distance wind blows over (fetch)
general human impacts on coasts
development
- increases cliff vulnerability
- raises interest in protection
agriculture
- soil erosion
- habitat made
industry
- pollution
- brings wealth to invest in protection
geology of christchurch bay
permeable sand on top of impermeable clay
- during wet weather heavy rain saturates permeable sand making it heavy and cliffs unstable
erosion on christchurch bay
soft rock - fast and risks settlements can increase flooding potential
landslips - sudden and dangerous
hardrock - can form formations eg arches
humans use of christchurch bay
- tourism + leisure
- infrastructure eg ports
- housing
- habitat
cost of further management christchurch bay
under £4000 mill
