sea level change

Question 1

flandrian transgression

Answer 1

a period of rapid sea level rise
9m in 1000 years

Question 2

tectonic sea level change

Answer 2

seismic activity may cause land to be shifted upwards or downwards
distortion of the crust due to tectonic movements can cause sea level to rise or drop depending on volume of the basin

Question 3

tectonic sea level change - Alaska

Answer 3

great alaskan earthquake
one side risen 9.1m higher, one side dropped by 2.4m

Question 4

tectonic sea level change - Japan

Answer 4

tokuku tsunami 2011
Honshu dropped 0.6m due to displacement of land despite tsunami defences

Question 5

eustatic sea level change

Answer 5

global change in volume of water in oceans as a result of glacial melting which contributes to volume of ocean water = sea level rise
- may become most significant factor due to climate change
sea ice DOES NOT contribute, ice occupies same volume of water as it displaces

Question 6

last glacial maximum

Answer 6

sea levels were lower
120m lower
Florida appears greater on map as was less submerged
papa New Guinea and Australia are separated by ocean now

Question 7

eustatic change in action

Answer 7

during a glacial period, glaciers and ice caps grow and sea level falls
during interglacial period glaciers and ice caps melt and sea level rises
= due to increase due to atmospheric warming

Question 8

isostatic change

Answer 8

local change in sea level due change in height of land relative to sea
weight lifted off crust (ice sheet melting in interglacial period brings weight off crust) causes isostatic rebound and rises, fall in sea level

Question 9

effects of sea level change in UK

Answer 9

Scotland rising due to isostatic change
south east UK areas are sinking by 1mm per year
= interglacial period means ice has melted which reduces weight on crust causing isostatic rebound

Question 9

emergence

Answer 9

relative fall in sea level/land rising

Question 10

submergence

Answer 10

sea level rising/land sinking