UK Physical Landscape Flashcards
Where is the UK’s main upland area?
north and west
Where is the UK’s main low land areas?
south and east
Igneous
formed when molten rock (magma) from the mantle cools down and hardens
the rock forms crystals as it cools
usually hard - granite
Sedimentary
formed when layers of sediment are compacted together until they become solid rock
Two main types of sedimentary rock in the UK
Carboniferous limestone and chalk - formed from tiny shells and skeletons of dead seas creatures
lime stone is quite hard
chalk is softer
clays and shales - made from mud and clay minerals, very soft
Metamorphic
formed when other rocks (igneous, sedimentary or older metamorphic rocks) are changed by heat and pressure
new rocks become harder and more compact
shale becomes slate with further heat and pressure, slate becomes schist
3 past tectonic processes that have shaped UK landscapes
Active volcanos
Plate collisions
Plate movements - UK position
How has Active volcanos shaped the UK landscape?
520 million years ago UK land was much closer to plate boundary
Active volcanos forced magma through the earths crust which cooled down to form igneous rock such as granite
How has Plate collisions shaped the UK landscape?
1) Plate collisions caused the rocks to be folded and uplifted - forming mountain ranges
many of these areas remain as Uplands - Scottish Highlands, Lake District, north Wales
2) Intense heat and pressure due to plate collision formed hard metamorphic rocks in northern Scotland and Northern Ireland
How has Plate movements shaped the UK landscape?
345-280 million years ago Britain was in the tropics and higher sea levels - Carboniferous limestone formed
this can be seen in northern England, South Wales and south west England
Granite
very resistant and forms uplands landscape
has lots of joints which aren’t evenly spread
impermeable - doesn’t let water through
How are tors formed?
Granite has lots of joints which aren’t evenly spread
the parts of the rock where there are more joints wear down faster
areas with fewer joints are weathered more slowly than the surrounding rock and stick out at the surface which forms tors
Moorlands
large areas of waterlogged land and acidic soil with low-growing vegetation
created by granite
Slate and Schist
Slate forms in layers creating weak planes in the rock
slate is generally very hard and resistant to weathering but it is easily split into thin slabs
Schist has bigger crystals than slate and also splits easily into small flakes
both often form rugged upland areas
impermeable which can lead to waterlogged and acidic soils
Carboniferous limestone
permeable so limestone areas have dry valleys and resurgent rivers
affected by carbonation weathering - happens along joints in the rocks creating features such limestone pavements, caverns and gorges