geo paper 2 4a Flashcards
(29 cards)
examples of igneous rock
granite
basalt
examples of sedimentary rock
chalk
carboniferous limestone
sandstone
clay
types of weathering
freeze-thaw
biological
chemical
physical/mechanical
examples of metamorphic rock
schists
slates
marble
shale becomes slate, slate becomes schist
characteristics of igneous rock
resistant to erosion
crystalline
hard
impermeable
granite landscapes are usually boggy and badly drained
characteristics of metamorphic rock
layered
more faults to be more eroded
crystalline
very hard
impermeable
badly drained and boggy
characteristics of sedimentary rock
less resistant
hard to very soft
some permeable, some not
limestone: caves and karst
chalk: dry valleys, gentle hills inland, steep cliffs at coast
clay: collapses easily wet slumping, gentle, wide landscapes, frequently waterlogged
formation of igneous rock
forms from volcanic activity
cooled magma
molten rock crystallises as it cools which can produce sparkly quartz within the rock
formation of metamorphic rock
sedimentary rocks close to tectonic activity
they’re formed under extreme pressure and temperature and compresses the rocks to create metamorphic rock
formation of sedimentary rock
forms gradually over time as dead organic matter and eroded rocks are transported to sea
sediments deposited on the seafloor which accumulate and compress to create the rock
where to find igneous rock
northern upland areas of UK
where to find metamorphic rock
near any places where there was tectonic activity
(upland)
where to find sedimentary rock
lowland UK
south, southeast, central UK
escarpment rock explanation
limestone is harder than chalk
chalk is harder than clay and shales
limestone and chalk are strong and permeable
clay and shales are impermeable
how is sediment moved
traction - rolling
saltation - bouncing
suspension
solution
how is sediment eroded
hydraulic action
abrasion - rocks against river bed
solution
attrition - rocks collide against each other
concordant vs discordant
discordant - bands of differing rock types, perpendicular to the coastline
concordant - same rock running parallel to the coastline
integrated coastal zone management
do nothing
hold the line
advance the line
managed realignment
how does the river changes from upstream to downstream
discharge, channel width, channel depth increases
average velocity, load quantity increases
load particle size, channel bed roughness, slope angle decreases
physical fwk key hypothesis
decisions made about coastal management in Start Bay are appropriate
physical fwk sub hypothesis
size of beach is bigger in the North
risk of flooding and erosion is highest in the South
most effective coastal management was sea walls, rip rap and beach replenishment
physical fieldwork key concepts
1) LSD directs sediment to North, SE prevailing wind (from windrose)
2) level of risk determined by Zoopla data
3) geology maps
physical fwk method/data presentation
1) beach profile, collection of line graphs
2) flood risk survey, table
3) cost benefit analysis, table
physical fwk interpretation of data and whether proven
1) no, further north, gradient flatter (could be storms in N, beach replenishment in S)
2) all areas had a low flood risk, yes
3) Beesands, Torcross, Sunnydale all benefit outweigh costs, yes